The DEA

 

Federal law enforcement agencies are among the only organizations that can afford to deploy this level of surveillance. The amount of training and the cost of equipment as well as the expense of maintaining a nine-person team over days or weeks of constant surveillance puts an astronomical price tag on these tactics. If the government has placed you under surveillance, they are reasonably sure you are a bad person. You are a gangster or a foreign intelligence agent or a notorious terrorist, and there is probably a kill team on its way to your house right now.