DUI testing for marijuana in Colorado involves a mix of field sobriety evaluations, officer observations, and chemical analyses—yet none of these methods are universally reliable. Because THC affects people differently and can remain in the body long after impairment fades, even a DUI marijuana test such as blood or oral https://libertylawcenter.com/what-tests-are-used-to-determine-impairment-in-marijuana-dui-cases/