The NHRA said Johnson registered a .027 reading on the alcohol breath analyzer during a drug and alcohol test Saturday morning.
The NHRA has a zero-tolerance policy with regard to alcohol. Any driver or official discovered to have a measurable blood alcohol content during track activities is immediately barred from any further involvement or participation in the event.
Johnson is subject to further disciplinary action, the drag racing body said.
In a statement released by Johnson, the Greeneville driver said he had “a few alcoholic beverages” with his meal on Friday night but felt no lingering effects.
“I fully support the NHRA’s zero-tolerance policy in regards to alcohol, and I understand their decision in this matter,” said Johnson, whose name was drawn randomly as part the the NHRA’s standard testing procedures.
“I would like to apologize to the NHRA, my fans, and to my sponsors for any disappointment that I have caused. I love drag racing, and I would never do anything to purposely disrespect the sport or its fans.”
Johnson entered the weekend second in the Pro Stock standings, 52 points behind leader Mike Edwards. He dropped to fifth with four events left in the Full Throttle Countdown to the Championship playoffs.
Larry Dixon (Top Fuel), Cruz Pedregon (Funny Car), Greg Anderson (Pro Stock) and LE Tonglet (Pro Stock Motorcycle) won their respective divisions Sunday.
Dixon stretched his points lead over second-place Cory McClenathan to 85 after the second of six events in the Countdown.