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There is a roadside test for pot

Dear Sir,
Re: ROADSIDE TEST FOR MARIJUANA USE NEEDED Tue, 10 Sep 2002
I am surprised that people still use this excuse when a widely used test is already available.
“Impairment Testing” using a device such as the Eye Dynamics SafetyScope, test for current impairment not whether someone had smoked pot two weeks ago. This sort of test has the added advantage of testing for all impairments including alcohol and even lack of sleep.
–Philip Slattery
Scotland.