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Law
Enforcement Physical
Ability Testing
Validation of
Tests for Deputy Sheriffs and Police Officers
Police Officers and Deputy Sheriffs perform one of the most
physically demanding jobs in the United States. Not only are these occupations
physically demanding, they are dangerous: Each year scores of law enforcement
officers lose their lives each year in the line of duty. Both of these
jobs have higher than average incidence of cancer, back injuries, disability
retirements, and workers' compensation costs than do workers in many other jobs.
This is due, in part, to the physical demands and environmental hazards
associated with the job.
Demands on local police and fire protection can only be
expected to grow in the aftermath of the attacks on New York and Washington,
D.C. and the creation of the Department of Homeland Security. Local public
safety resources, already stretched thin, have been asked to assume more and
more responsibility for the maintenance of public safety from a growing array of
potential threats.
An important function of local government is to develop minimum requirements for
Deputy Sheriff and Police Officer
certification including the assurance that individuals placed in these jobs are
physically capable of performing the work. This activity must be performed in accordance with the applicable state and federal fair
employment laws.
The Uniform Guidelines on Employee Selection Procedure
state that any test (for either new hires or employees) must be developed in
accordance with "professionally accepted methods." Unless the employment tests
are developed in a manner consistent with the Guidelines they cannot be
defended. Agencies seeking to implement physical ability testing programs must
comply with the Guidelines, if they are to have a reasonable chance of
prevailing in a legal challenge.
The Civil Rights Act of 1964 (as amended), the Americans with
Disabilities Act of 1990 and the Civil Rights Act of 1991 require that job
applicants be tested in relation to the physical demands of the relevant job. In
order to comply with these laws, the job must be scrutinized to separate
essential functions from those which are not essential. If the applicant is
failed and files a complaint, the employer must be prepared to demonstrate that
the applicant cannot perform the physical demands of the job or would do so only
at the detriment of the applicant or the employer.
It is our experience that a valid physical screening program
must be based on a solid foundation of job analysis. A proper job analysis
provides the basis for the development of a realistic physical ability test to
help identify applicants who have the greatest probability of job success and
the least probability of injury or illness.
Work Sample Tests
Simulation and work sample tests are deceptively simple.
Seemingly straightforward and easy to construct, these tests have been subjected
to countless legal challenges on a wide variety of grounds. Often these tests
have been found deficient due to the lack of an adequate job analysis, lack of
relationship between the job and test performance, and the arbitrary nature of
the cutoff score, etc. Pass points have been set using unscientific and
arbitrary formulas such as setting the pass point at the level of the lowest
performing currently employed incumbent or even on the basis of how persons
appear in videotape simulations. Often the job analysis is not comprehensive
enough to support the test in the event of a legal challenge.
This is not to say that work samples cannot be properly
developed. If constructed with care, such tests are very valuable in screening
new hires or to determine if incumbent officers remain able to perform the
functions of their job.
The MED-TOX approach to test validation involves the
construction of both a work
sample test and a physical ability test to allow for the criterion-related
validation of both test types in a single study. The approach described below
demonstrates how a work sample test can flow from a comprehensive job analysis
and how physical ability tests can be developed based on those abilities used to
perform the work sample tasks. This is the essence of criterion-related
validity.
OUR APPROACH
The MED-TOX approach involves assessing the content of at
least seven North Little Rock occupations. According to Section 14C (2) of the
Uniform Guidelines:
There should be a job analysis which includes an analysis
of the important work behavior(s) required for successful performance and
their relative importance. Any job analysis should focus on the work
behavior(s) and the tasks associated with them... The work behavior(s)
selected for measurement should be critical work behavior(s) and/or
important work behavior(s) constituting most of the job. [emphasis
added].
Since the Uniform Guidelines require that any
content-related test measure the content of most of the job, our approach begins
with a determination of that content. Several Content Areas will be
determined for both the fire and the police classifications. Within each Content
Area, we expect to find a large number of tasks. An example of a Content Area
and a task is shown below:
Tasks will be categorized by Content Area in this manner:
Content Area: Subdue and Restrain
Task: Wrestle with a resisting
suspect in order to place handcuffs on him.
There are a number of Content Areas that are unique to
law enforcement work
(Patrol, Traffic, Investigative, Emergency Response, Subdue and Restrain, etc.)
which are derived during the job analysis. Using these content areas is
important because it assists in documenting that the content of the job is
assessed by the test that is subsequently developed. Without this documentation,
it will be difficult to know if the physical ability tests overemphasize some
aspects of the job and under-emphasizes others.
In addition to Content Areas, Ability Dimensions will
be utilized. Ability Dimensions have been identified from the research
literature. Among the most important Ability Dimensions for physical ability
test development are:
Muscular Strength
Anaerobic Power
Muscular Endurance
Trunk Strength
Flexibility
Cardio respiratory
Endurance
Tasks will also be categorized by Ability Dimension in this
manner:
Ability Dimension: Muscular
Endurance
Task: Wrestle with a resisting
suspect in order to place handcuffs on him.
The use of Ability Dimensions ensures that all of
the relevant physical attributes are assessed by the test. Taking care to
perform these activities bolsters the legal defensibility of the test. This
approach can also lesson adverse impact. For example, tests which emphasize arm
strength tend to have an adverse impact against untrained females. Tests that
emphasize flexibility adversely impact untrained males. Using Ability Dimensions
will also help ensure that a range of abilities is assessed by the test.
The MED-TOX approach relies almost exclusively on the input
of currently employed incumbents. We have no commercially
prepackaged test to sell. We have a carefully designed process to
manage. The process is to determine to what extent performance on the
physical ability test (example: grip strength) is related to performance on the work
sample measures. Correlation, regression, and analysis of variance provides
the necessary information to determine which ability tests should remain in the
final test battery and which should be excluded.
Ability tests have been shown to be both valid and reliable
measures of human performance. The tests are inexpensive and national normative
data exist to allow comparisons by gender and age. Ability tests are also useful
in providing testing information to job applicants or incumbents allowing them
to evaluate their own fitness. Such tests also permit individuals to practice.
If an individual knows he or she will be required to do "x" number of Sit-ups,
doing sit-ups is the best way to practice for such a test. A partial listing of
common ability tests is shown below:
COMMON PHYSICAL ABILITY DIMENSIONS AND THEIR MEASURES
|
Muscular Strength
|
Jamar Grip Strength
Test, 1 RM Bench Press, Jackson Strength Evaluation System, Arm Hang |
|
Anaerobic Power
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Vertical
Jump, Standing Long Jump, 50 Yard Dash, Wingate Test of Anaerobic Power |
|
Muscular Endurance
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Push-ups in 1
min, Arm Ergometer, Pull-ups |
|
Trunk Strength
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Sit-ups in 1
min, Crunches |
|
Flexibility
|
Bend, Twist &
Touch, Sit & Reach |
|
Cardio respiratory Endurance
|
Bicycle
Ergometer, Step Test, One Mile Walk, 1.5 Mile Walk-Run |
Based on a physiological analysis of each work
sample event, a set of physical ability tests will be hypothesized to
correlate significantly with each work sample.
The work sample tests will be taken by a sample
of incumbent volunteers. Gender and age will comprise two important variables as
well as current assignment. Since range restriction can be a problem that
lowers the validity of a test when very similar persons
comprise the sample population, MED-TOX has devised several techniques
to overcome this potential problem.
EXAMPLES OF LAW ENFORCEMENT TESTING
Incumbent testing is critical to test validation.
Below are photographs of law enforcement officers participating in test
validation. Jamar grip strength is a common measure of muscular
strength.

Other common tests of physical ability included the
vertical jump:

Sit-ups and push-ups are common tests of muscular
endurance.


MED-TOX uses the Jackson Strength Evaluation System
for jobs in which lifting or carrying are essential functions. The
Jackson Grip Test is shown below.

The Jackson Arm Lift and Shoulder Lift require
muscular strength.


The Leg Lift and Torso Pull comprise the 4th and 5th
Jackson measures.


The Bend, Twist and Touch test has been demonstrated
to correlate with law enforcement work samples.

The 100 yard dash is a standardized measure of
muscular power.

Work Samples can involve a variety of law enforcement
tasks.

The wall climb, pursuit run, pursuit obstacle courses, and
body drags comprise other work samples.






DETERMINING THE PASSING POINT
The passing point should be set in a manner consistent with
professional recommendations. The MED-TOX methodology for setting the passing
level is based on multiple forms of evidence collected in the
job analysis, incumbent testing, and on the basis of expert judgment. MED-TOX does not set passing
levels on the basis of the lowest scoring currently employed incumbent,
"one standard deviation below the mean," or by some other arbitrary and
defenseless formula. Passing levels are also not set on the basis of the gender or age of the individuals taking the test since this type of score
adjustment was banned by Congress in 1991.
Call MED-TOX at (909) 944 2404 for more information about the
criterion-related validation of law enforcement occupations.
© 2008 MED-TOX HEALTH SERVICES
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