Without forensic evidence, it is very hard for police to prove what has happened and, as a result, very few people in Australia have been convicted for drink spiking.
"Usually the women have no clear memory of what happened, which makes a police investigation even harder," McLeod said.
"But you assume the worst. You don't know how many people have been involved and you don't know whether photos or videos have been taken and you're up on the Internet."
Successful prosecutions remain few and far between.
One of Australia's few successful convictions was against flight attendant John Robertson who was caught when police found photographic negatives of several naked, unconscious female flight-crew members during a raid on his Gold Coast home.
The raid followed several complaints about Robertson -- but no forensic evidence -- and he was jailed for six years in 1996.
One victim, a fellow cabin crew member, told the court she blacked out in a hotel after drinking some hot chocolate made by Robertson. She awoke 12 hours later, wearing only her underpants.
The surge in drink spiking in Australia has mirrored similar trends in the US and Britain where on-the-spot tests are now sold to check drinks.
In Australia a matchbox sized kit called Drink Checker was launched this month with a dropper and testing pad to check for the most common date rate drugs, GBH, Rohypnol and Ketamine.
"This can give people reassurance their drink has not been tampered with," said spokesman for Drink Checker, Sunil Lodhia.
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