A woman crashed her car into a tree at Mooroopna early on Saturday, September 16.
Shepparton police Sergeant Mark Phillips said the woman was towing a trailer when she ran off the road and crashed into a tree on Toolamba Rd, near Pyke Rd, about 1.30am.
The woman told police at the time that she had fallen asleep at the wheel.
Sgt Phillips said the woman, 40, allegedly tested positive to drugs in a roadside drug test after the crash.
The test has been sent for analysis.
Sgt Phillips said that if that test also returned positive, the woman would be fined or summonsed to a magistrates’ court on a drug driving charge.