Gardai stopped two cars racing on the M1 in Drogheda on Saturday evening with one testing positive for drugs.
Officers chased down two vehicles doing over 175km/h on the motorway before drug testing both.
One of the motorists was found to be positive for cocaine, cannabis and opioids.
A garda spokesperson said: "Drogheda RPU detected two cars racing on the M1 northbound at 175km/hour this evening. Drivers were stopped and drug tested.
"One driver tested positive at the roadside for Cocaine, Cannabis and Opioids. Driver arrested and charged with dangerous driving."
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