It is usually the most serious drug charges that are prosecuted in federal court and many involve either very large quantities of a controlled substance or a large conspiracy that is involved in the possession, distribution, sale, trafficking, cultivation, and manufacturing of various controlled substances.
Perhaps more so than any other type of charge, a federal drug charge, or potential accusation, requires immediate legal counsel because of the incredibly high stakes and because of the possibility that exposure can be limited by developing a plan, which includes protection, upfront.