TALK about a marriage going to pot!  U.S. House Speaker JOHN BOEHNER is set to walk his daughter Lindsay down the aisle – but does he know his new son-in-law was busted for marijuana possession?

The ENQUIRER learned that Florida police ar­rested Lindsay’s fiance, Dominic Lakhan, in Pembroke Pines back in 2006 after pulling him over for a traffic violation.

“Upon making contact with the driver,” states the police report, “officer ob­served in plain view a 16 oz. Natural Lite beer can opened in the driver door.

“Officer also detected the odor of burnt cannabis emit­ting from the interior of the vehicle.

“A search of the vehicle revealed two bags contain­ing approximately 2 grams of suspected cannabis… inside the center of the ashtray. Suspect admitted to the possession of the can­nabis, stating that it was for personal use.”

Jamaican-born Lakhan, who resembles reggae leg­end Bob Marley, was taken into custody and charged with misdemeanor posses­sion.

For ALL the details including what’s on the couple’s wedding registry and to see the arrest report docs – it’s ONLY in the new ENQUIRER – on sale NOW!