I can't link you a percentage no but I do have these actual scientific studies in response
http://www.ncjrs.gov/pdffiles1/jr000243c.pdf
http://www.ncbi.nlm.nih.gov/sites/en...&dopt=Citation
These next ones come from a medical site so I will post the link and the excerpt since you don't have a membership (membership is free if you would like to read the entirety of the article however)
http://www.medscape.com/viewarticle/417778
Quote:
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GHB became popular as a drug to help assault women.[1,2,10] Several properties of this drug account for its popularity as an tool in sexual assault. First, although no longer legally accessible, GHB is easily and cheaply manufactured in the home. Second, the drug is colorless, tasteless, and odorless, and it mixes well with all liquid and foods; as a result, it is easy for an unaware person to consume this drug. Third, shortly after consumption of GHB, sedation is rapid, and amnesia is complete.[1] The sedated person will not recall any events that occurred shortly before or during the period of sedation, including rape, physical abuse, or even the person they were with shortly before becoming unconscious. These effects make GHB an ideal agent of assault. A rapist could sexually assault a woman, and the victim would not recall the details of the experience. As a result of the victim's amnesia, the rape might not be reported.
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http://www.medscape.com/viewarticle/410558_1
Quote:
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Drug-facilitated sexual assault has become an increasingly common method of violent sexual aggressionother CNS depressants such as flunitrazepam and GHB are increasingly used as "knock-out drops" to render female victims helpless and amnesic.
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http://www.medscape.com/medline/abstract/16681170
Quote:
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The term "date rape drug" has traditionally been applied by the media to powerful sedatives, such as gamma hydroxybutyrate (GHB) and flunitrazepam (Rohypnol), which can render a person unconscious and hence unable to resist and/or recall an assault. However, some law enforcement agents and others have recently obtained convictions by arguing that the empathy-generating and sensual effects of MDMA, and an occasional increase in disinhibition and sexual desire linked with methamphetamine use, remove a person's ability to give a reasoned consent
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http://www.medscape.com/medline/abstract/14743937
Quote:
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Lifetime prevalence of incapacitated rape was nearly identical to prevalence of forcible rape, with about 1 in 10 women reporting each type of rape since age 14.
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I can get more if you would like
As for just the extremely high BAC - here in Australia if you purposefully get someone drunk in the aims of sleeping with them it's classed as rape and you can be charged for it. To me alcohol is a date rape drug - if you don't get informed consent it's rape.
Also with the vast majority of these 'date rape drugs' they come with amnesianic side effects considering that for a urine test (which is more accurate then a blood test in regards to drug traces) has to be performed with 96hours if first consuming the drug these cases are extremely hard to pin down.
Then again I am somewhat skewed - earlier this year i was out with friends and one of them Joie said her drink tasted a little funny, Joie is very petite, 5'4" maybe 100 - 120lbs, her bf drank it he's over 6ft and probably about 200lbs. We ended the night at the hospitalgetting his stomach pumped after he collapsed, he was our driver for the night so during the time we were out he had coke, 1 light beer and that drink. If it did that to him got to wonder what it would do to her.