Prison officials have seized more than $127,000 in contraband from the perimeter of Stony Mountain Institution, just north of Winnipeg.
The contraband was discovered in three packages since the beginning of February, containing crystal methamphetamine, pills, tobacco, miniature cell phones, and other electronic components.
The Correctional Service of Canada says it uses a number of tools to prevent drugs from entering its institutions, such as ion scanners and drug-detector dogs to search buildings, personal property, inmates and visitors.
The CSC says police have been notified and the institution is investigating.
Stony Mountain Institution is a medium-security prison and houses approximately 570 inmates.