You can now anonymously drop tips on drug dealers by texting the Drug Enforcement Administration New England Field division. It's powered by Citizen Observer and can be used by anyone who has a cellphone, you don't need a smartphone. You can report drug activity, suspected money laundering or suspicious activity directly to the DEA agent.
The number is 847411. Write that in the "to" field and the keyword DEADRUGS followed by your tip. All of this information is anonymous because the Citizen Observer technology removes your information from the message before it is handed off to the feds.
Agents can send you a follow-up response, but they won't know who you are.