To avoid concussion rules, some players sandbag their baseline tests

Why is a comprehensive neurologic evaluation important after a concussion?

As physicians we treat people and not tests. Tests provide supportive data that quantify deficits. If you game the test or use non-standard testing conditions, the data can be flawed.

Dr. Rotenberg

To avoid concussion rules, some players sandbag their baseline tests

NFL players are given tests to determine their baseline brain functioning so that if they suffer a concussion, they can be held out until they return to their previous levels. But NFL players often don’t want to be held out after they suffer a concussion. And that may lead to some of them intentionally doing poorly on baseline tests.

http://profootballtalk.nbcsports.com/2011/04/22/to-avoid-concussion-rules-some-players-sandbag-their-baseline-tests/