A speeding Audi driver tested positive for cocaine and cannabis on the road side, according to Thames Valley Police.
The driver was travelling over 30mph on King's Road in Reading on Monday.
Police pulled him over and found the man had been drug driving.
"Now a nervous wait for the driver whilst the blood sample is sent away to be tested," wrote an officer on Facebook.
Read more: Mercedes and van drug drivers caught
The news comes after a different man wanted by Reading courts for disqualified driving was caught drug driving in Slough on Friday.
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