Police are calling for witnesses after numerous possible cases of drink spiking in the Ballarat area on Saturday, January 12.
Investigators have spoken to three people who have reported being unable to recall parts of their evening.
All three people, that have made separate reports, attended a number of different licensed premises in the region across Saturday night.
None of the affected parties required medical treatment.
Anyone with information is urged to contact Ballarat Police on 5336 6000 or contact Crime Stoppers on 1800 333 000 or submit a confidential report at www.crimestoppersvic.com.au.