It depends on the circumstances. Based on all the drug cases I've seen, the more direct the connection between the referral and the transaction, and the more the evidence supports specific INTENT regarding the transaction, the stronger the possibility of a case. So, if a bro asks his good friend who HIS source is, and the friend tells him, and the bro at some point much later on purchases gear, a charge is unlikely, particularly if it appears that the referrer was acting as an agent (helper) of the BUYER, not the seller. I haven't seen any arrests in that kind of situation. But at the other end of the spectrum, take street drug sales. Typically, a crack deal is effected by multiple players all working together. The "steerer" makes the initial contact with the buyer, and refers the buyer to a second individual who takes the money. A third individual hands over the drugs. All three individuals can be arrested and charged with the sale ("aiding and abetting" a crime is subject to the same liability as being the principal actor) or with a conspiracy (based upon their AGREEMENT to commit the crime). Some Internet-based scenarios could be analogized to this sort of multi-player arrangement. So, there could be situations where there is risk.
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