The RCMP and federal transport officials have dropped their investigation of Conservative MP Gurmant Grewal over an incident at Vancouver International Airport.

Grewal was accused of having broken airport security rules on June 4 when he asked strangers to transport a package for him on a flight to Ottawa. The package allegedly contained tapes of secretly recorded conversations of talks between Grewal and senior Liberals

But the RCMP say there was nothing criminal about the MP's actions, since Grewal had already passed through security.

"He was on the secure side," RCMP Cpl. Dave Williams told Canadian Press. "You can exchange packages as long as everybody knows what's in the package."

He added that the RCMP never launched a full-scale investigation in to the incident.

"If we found out that it had come in from a non-secure method, we may have been involved,'' Williams. "But we had no evidence to even suggest that.''

Transport Canada has also cleared Grewal of any wrongdoing, telling the MP in a letter that he had not contravened the Aeronautics Act.

Air Canada is still conducting its own investigation.

Grewal has been on stress leave since a few days after the incident, and has given up his parliamentary duties.