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A new U.S. Department of Transportation drug testing report shows that the overall 2016 lab-reported positive drug test rate for truck drivers and other DOT security-­sensitive employees rose to its highest level since at least 2009, including year-­over-­year increases in three of five drug categories.

The U.S. average retail price of diesel dropped 3.5 cents to $2.489 a gallon, while the stubborn glut of crude caused oil prices to tumble to about $43 a barrel — a range last seen in early August — and into a bear market, experts said.

Oil slipped to the lowest since November as weaker demand at the start of the summer driving season led to another increase in gasoline stockpiles.

Oil fell for a third week as rising supplies from the United States to Nigeria to Libya showed that OPEC is still struggling to clear a global glut.

U.S. diesel and gasoline prices each made modest moves during the week ended June 5 but in different directions. Diesel slipped 0.7 cent a gallon and gas rose 0.8 cent, while crude oil dropped toward this year’s low point below $46 a barrel.

Oil tumbled to the lowest intraday level in four weeks June 7, as U.S. industry data showed an unexpected increase in crude inventories. Gasoline stockpiles also rose.

The U.S. average retail price of diesel dipped 0.7 cent to $2.564 a gallon, the Department of Energy reported June 5.

The U.S. diesel average reversed direction and rose 3.2 cents a gallon to $2.571 on May 29, taking back more than half of the decreases from the previous five weeks combined, the Department of Energy reported.

The five-month campaign to upgrade Louisiana's jammed roads and bridges by raising the state gasoline tax died May 31 with little fanfare in the Louisiana House.