Guess what, those swarming insects aren’t the only bugs on the Burning Man playa these days. See, until this week, the only thing attendees had to worry about were cops trying to make drug busts. But those days of wide-pupiled innocence are officially over—the FBI admits it’s been sending in undercover burners—for what purpose we may never know. The documents, obtained in connection with a FOIA request published by MuckRacker, show the FBI has quietly maintained a presence at the festival for at least five years. This, despite noting that “The greatest known threat in this event is crowd control issues and use of illegal drugs by participants.” Still, FBI officials say their presence has been necessary to prevent “terrorist activities” at the weeklong desert rave.