One of the world's largest annual music and arts festival is underway in the Black Rock Desert of Nevada.

The 2018 edition of Burning Man began yesterday (August 26), bringing some 70,000 people from around the world together for nine days and nights of radical expression and community.

Burning Man also brings together a lot of drugs. That's been no secret since the festival's humble beginnings in 1986.

This year, however, Burners still on their way to Black Rock might want to exercise extra caution if they're carrying something that's listed in the United States' Controlled Substances Act. Reportedly on the order of President Donald Trump himself, Nevada law enforcement is applying a heavy hand with checks and searches.

"Driving through Nixon, Nev. has allegedly slowed as police are searching vehicles heading to Burning Man that may have drugs on board," reads an August 20 report by This is Reno. (Located two and a half hours' drive south of Burning Man, Reno is the festival's nearest major city.)

"Opiates in particular, according to the Pyramid Lake Paiute Tribe’s Secretary Brenda Henry," the report continues.

Henry went on to add a friendly warning.

“If you don’t have anything to hide, you’re good to go,” she told the local news outlet.

This is Reno asked Henry who or what agency had ordered the crackdown, and she confirmed that it had originated in the White House.

A number of Burning Man threads on Reddit recount aggressive police tactics experienced by people who travelled to the festival site during the previous few days.

There's only one road in and out of Black Rock City. With eight nights to go until Burning Man's climax on September 3, travellers still en route might want to heed the advice of those who have already had to go through law enforcement's checkpoints.