 Opponents spent $1.6 million fighting the measure.The measure was opposed by the editorial board of The Sacramento Bee.On January 31, 2018, San Francisco District Attorney George Gascón announced his department would begin to retroactively apply Proposition 64 to misdemeanor and felony marijuana convictions dating back to 1975, recalling and re-sentencing up to 4,940 felony marijuana convictions and dismissing and sealing 3,038 misdemeanors.