Organisers of proposed pill-testing at Victorian events risk prosecution if they proceed with plans for a trial, police have warned.

New internal legal advice from Victoria Police has indicated that people conducting pill-testing to determine the make-up of illicit substances could face criminal charges.

"The MDMA content in an ecstasy tablet can vary widely and new synthetic drugs are constantly appearing on the market," Shane Rattenbury said. Credit:Viki Yemettas

In a statement, Victoria Police said those handling illicit substances as part of a pill-testing service could be liable for prosecution, under current conditions.

"In Victoria it is currently unlawful to use, possess, cultivate or traffic illicit drugs in any form," it said.