Tests done for STDs within a few hours of the assault determine whether a disease existed before the assault occurred. This information may be helpful if you go to court. They may not be necessary if prophylactic medications are given. A survivor can then make an informed decision regarding testing. In cases where there is a significant risk of exposure the law allows for a defendant to be tested for the presence of the HIV virus and for those results to be disclosed to a physician designated by the victim.
Pregnancy tests take at least ten days to detect a pregnancy.
The test is done at the time of the assault to indicate that the condition was not present then. Rohypnol is a drug that induces amnesia and sometimes unconsciousness. It can be slipped into a drink undetected. The drug companies are going to put a blue dye in it so it will be seen in drinks when diluted. Light color drinks will then turn blue and dark colored drinks will then become murky and have white granules that will float to the top.