This guide sets out the law of controlled substance offenses from classification through post-conviction relief. It begins with the scheduling framework and the definitions that determine what a substance is, then works through the offense sections in the order a charging decision follows: simple possession, possession with intent, distribution, manufacture, conspiracy, and the aggravating provisions for premises, protected locations, minors, and enterprises. Separate parts address quantity as an element, the prior-conviction enhancement and its filing deadline, firearm enhancements, and the two routes below a mandatory minimum. The defense part covers suppression, constructive possession, mental state, quantity challenges, and role. Later parts cover forfeiture, prescription prosecutions after recent authority, diversion and treatment courts, sentencing and post-conviction modification, and collateral consequences that must be analyzed before any plea.