As one of the forerunners in marijuana decriminalization and legalization nationwide, Colorado has also taken measures to help prevent legal recreational and medical marijuana from being used by those who plan to drive in the near future. However, because the active ingredient in marijuana is fat-soluble and tends to accumulate in your system with repeated use, law enforcement professionals can often find it difficult to determine whether a driver suspected of operating under the influence ingested marijuana just a few minutes before getting behind the wheel or a few days (or even weeks) ago.
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