A sniffer dog helped search 2,000 students as police swooped on a secondary school after rumours circulated about drugs on the site.
Ivybridge Community College searched students last Friday, but said no illegal substances were found.
Police were called and ten officers, along with teachers and a sniffer dog, were involved in the unannounced mass search.
An MP last night praised the school for taking "swift action", despite no drugs being found in the operation.
Police Sergeant John Livingstone, neighbourhood team leader for Ivybridge, said: "I got a call from the deputy principal about the concerns that had been raised by parents that drugs would be going into the college last Friday.
"We got hold of a drugs dog, which stood in the gateway to school, and officers were at the other entrance. We wanted to show that the college and police are working together."
South West Devon MP Gary Streeter said: "Ivybridge Community College has zero tolerance and rightly so.
"I'm sure parents will be pleased with the swift action that was taken."
The college declined to comment.