Perspective: Pseudoscience and the Detection of Marijuana-Based Impairment-We Can and Must Do Better.

Existing tools for making workplace and roadside determinations of marijuana-based impairment are inadequate. They either merely imitate tools used to identify alcohol- based impairment without taking into account important differences between these molecules, or they are pseudoscientific "police science." Legalization of marijuana use must be accompanied by urgent efforts and dedicated funding for the development and implementation of practical, accurate, and objective methods for on-the-spot determination of whether a person is dangerously impaired by marijuana.