Meth and amphetamine are very different drugs, but a bootlicker wouldn't know the difference. She could also have been spiked and left to die by the cop, can't really know without a proper investigation, which the police never subject themselves to.
Believe it or not, marijuana (since 2018 only strains containing significant levels of delta-9 THC) is illegal in the US in almost all circumstances, but methamphetamine is legal with a prescription.