What is the legal definition of the facilitation of a drug transaction?

"Facilitation" of a drug crime is similar to "aiding and abetting" a drug crime, the definition for which is found at 18 USC Section 2. It says: "Whoever .... aids, abets, counsels, commands, induces or procures" ...the commission of an offense ..."is punishable as a principal. " What kinds of acts might be considered acts that "facilitate" or "aid and abet" a drug crime? Examples might be a person driving the seller to the site of sale, knowing he is going to meet the purchaser and conduct the sale there. Or making a telephone call to the buyer on behalf of a seller and telling him the time and place of the meet. Or, letting a friend use your money to purchase the drugs, even if she promises to pay you back. Or letting a friend store the drugs in your basement. Anything one does to assist a drug transaction, with knowledge of the criminal objective could be considered facilitation. Under federal law, the person who facilitates or aids and abets the crime is subject to the same punishment as the actual perpetrator.