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Re:The New York Times Calls for Marijuana Legalization by eurleif on Saturday July 26, 2014 @07:08PM (#8091175)
There's apparently a breathalyzer in development[0] that can detect use within the past two hours.

[0] http://www.ctvnews.ca/canada/thc-breathalyzer-could-help-pol...

Re:The New York Times Calls for Marijuana Legalization by acomjean on Saturday July 26, 2014 @07:15PM (#8091196)
if it works, that would solve the problem of detection.