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From: Robert Swotinsky MD
Password: orange
Date: 11 Jul 2008
Time: 15:16:17 -0700
Remote Name: 71.233.246.147
These are detected briefly in blood. After all, this is among the features that make these drugs problematic for law enforcement -- they are short lived and thus hard to detect. For example, GHB concentrations peak in blood within 1-2 hours, and drop quickly within a few hours. Ketamine would likewise be detectable in blood briefly, probably not the next day. Rohypnol (fluinitrazepam) lasts somewhat longer -- half life of around 19 hours - and Rohypnol and its metabolites may be detectable in blood for a few days. Urine detection periods would be longer, though probably no more than 3 days for GHB and ketamine, and perhaps longer for Rohypnol.
I don't believe rape test kits are standardized. When I briefly searched the Internet for this, I came up with generic suggestions for drug tests, e.g., see http://www.merck.com/media/mmpe/pdf/Table_252-1.pdf. I suspect the panel of drugs in the test would vary by hospital and/or, where applicable, between various law enforcement agencies. Sometimes the testing authority has a core, standard panel that it supplements with the more exotic tests based on suspicion that those particular drugs were used. This information should be available for any particular incident by contacting whoever conducted the test and asking what they usually test for (asking for a listing of their standard panel).