FIELD SOBRIETY TESTS #1
The National Highway Traffic Safety Administration recommends police administer three "Standardized Field Sobriety Tests" to assess whether individuals are under the influence of drugs or drink. Failure of all three tests has been shown to correlate highly with a blood alcohol concentration over the limit: 0.08g/1,000 millilitres.
WALK-AND-TURN--Suspect is asked to take nine steps heel-to-toe on a line, turn on one foot, and return in the same manner. Using arms to balance, taking an incorrect number of steps, beginning before instructions are finished, etc., are considered signs of impairment.
Benjamin Franklin (1706-90)