The 18-year-old was caught speeding at 117kmh. A test at the scene detected cocaine use.
Gardaí are awaiting blood test results before deciding how to proceed with a dangerous driving investigation.
An 18-year-old was arrested and his car seized last Thursday morning.
He was caught speeding on the N25 in Wexford while allegedly on cocaine.
The learner driver, understood to be from Wicklow, was unaccompanied and had no L plates on display when detected by Gardaí travelling at 117 kilometres an hour.
The driver failed an oral test at the scene, with cocaine detected.
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