It's not likely but it is possible. Browse around the forum and you'll find threads about suspicious vendors. Usually they try to get you to pay with a trackable payment system like PayPal or Western Union. NEVER do that. Only use bitcoins and the escrow system on SR. Stick with vendors who have a long history of successful transactions and you reduce the chances of interacting with LE . Remember, they can't send real drugs, so an LE vendor would quickly be identified as a vendor who never sends product, or sends fake stuff. It would be hard to differentiate LE from a scammer in that sense. SR doesn't charge the buyer anything. Vendors pay a commission, but that's usually incorporated into the price of the product.