When a police officer stops a driver suspected of driving drunk, he or she will probably administer a field sobriety test. As its name implies, this is an on-the-spot test targeting the physical and mental capacities typically impaired by excess alcohol consumption. Failing this test can be one of the grounds for DUI charges.
However, a widely documented problem with the field sobriety test is that it fails to account for numerous factors, other than alcohol, that can inhibit performance, including a wide range of health conditions. While some drivers are able to let officers know up front about any conditions, others may feel too intimidated to speak up. Although police officers are supposed to get training on the proper administration of the field sobriety test, some may neglect to make sure there are no relevant medical conditions present.