Can Sobriety Tests Weed Out Drivers Who’ve Smoked Too Much Weed?

In Colorado, participation in so-called “Standardized Field Sobriety Testing” is VOLUNTARY. If you are pulled over by law enforcement, ALWAYS refuse to participate in these “tests.” Inaction CANNOT be used against you. Just like remaining silent cannot be used against you. The “tests” are difficult to pass, even if you are sober. Moreover, the results are unreliable.

http://www.npr.org/2017/01/25/511595978/can-sobriety-tests-weed-out-drivers-whove-smoked-too-much-weed