If she was slipped something like GHB or such, she would have had to had blood taken and tested pretty quickly to catch that.
I too was curious if the Rape Kit was also used when she was at the hospital altho per reports no DNA was forthcoming, likely pictures and some local ointments were in order and not much more or so it sounds.
They should have done a tox screen and alcohol test. I think they did the alcohol test and O'Reilly just stated that supposedly it was negative. Drugs? Maybe she was worried that she'd get nailed for drugs so she cried rape to mask that.
I've read the rape kit was employed and the total exam lasted nearly five hours, which is long even for a rape kit, but that may have included the time she was at the hospital screaming and hollering before they started the process. Rape kits take about 3-4 hours to complete.