SEXUAL predators are using date-rape drugs in Kirklees.
The warning came today from local health experts.
The news comes after an alarming number of people came forward last year saying they had been drugged and raped in the area.
Across West Yorkshire at least 42 rapes were blamed on memory-loss drugs, including Rohypnol, GHB (gamma hydroxybutyric acid) and Ketamine.
And at Huddersfield's genito-urinary medicine clinic at Huddersfield's Princess Royal Community Health Centre, doctors noticed an increase in the number of rape victims who had been drugged.
Dr Lindsay Short, the head consultant at the Greenhead Road clinic, said: "I have seen about 12 people in the last six months who have been affected by rape drugs.
"It seems to be on the increase, especially among people going on holiday to places like Turkey."
And the figures could be even higher, says rape victim support group Star, which deals with victims referred by various organisations, including the police.
Barbara Siedlecki, manager of the organisation - Surviving Trauma After Rape - said many victims did not come forward.
She said: "Some people have no memory at all and feel silly about coming forward.
"They feel they can't say anything because they genuinely don't know what happened.
"It is awful. We get clients who daren't leave home and some have moved to another area just to get away from where they live because they don't know what happened.
"It just turns their lives upside down and the problem is they can't tell people because they don't know."
Ms Siedlecki said many of the drugs used by attackers passed through the body so quickly they could not be traced.
She added: "The police do their best, but they have to work on evidence. If the drugs have left the body there is not a lot they can do and attackers get away with it."
Bryan Dent, West Yorkshire Police force drugs co-ordinator, admitted rape drugs were a problem.
He said: "We are not dismissing it, because clearly there is a problem.
"But we have no solution as to how we can capture evidence. The drugs we are talking about go through the system so quickly, within 24 hours.
"It is very difficult to determine what happened."
He advised people - especially young women - to keep an eye on their drinks and to look after their friends.
He also warned people against accepting drinks from strangers.
* Anybody who has been affected by rape can contact Star confidentially on 01924 298954.
* Most date-rape drugs leave victims physically helpless and unable to remember what happened.
* The drugs are often colourless and odourless and have no taste when added to victims' drinks.
* Rohypnol (flunitrazepam) is one of the most common rape drugs and is legal on prescription.
* It enhances the feeling of drunkenness and makes users lose their inhibitions.
* They can also suffer memory loss.
* The pill dissolves in liquids and new pills turn blue when added to liquids.
* However, the old pills are colourless and are still available.
* Street names for it include rophies, ropies, roofies and R-2.
* Anybody who thinks they have been a rape drug victim should contact police or visit a hospital immediately.