Some states have shifted from banning fentanyl test strips to colleges requiring them on campus.
Source: CampusDrugPrevention.gov
But like chocolate chips in a batch of chocolate chip cookies, fentanyl is not evenly spread throughout pills. Parts of the pill that are tested cannot be used, but a part of the pill that has not been tested could be lethal.
A CBS News Sacramento investigation breaks it down for you.
Watch this CBS News Sacremento Video: