Metered dose inhalers can give a false-positive breathalyzer result.

  There are some cases of this actually happening.

  Some of the newer HFA inhalers contain small amounts of ethanol as a co-solvent. After inhaling the medication, this ethanol becomes aerosolized in the lungs...which can be picked up by a breathalyzer.

  Even inhalers that do not contain ethanol as a vehicle can trigger a false reading. The chlorofluorocarbon (CFC) propellants used are chemically similar to ethanol and have been known to interfere with breathalyzer readings.

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