Note that no drugs were found in her system but yet the supposed killer, Karr says he drugged her:
John Mark Karr, 41, was arrested Wednesday, a day after he began teaching second grade in Bangkok, District Attorney Mary Lacy told reporters in Colorado. JonBenet was found beaten and strangled in the basement of her family's home in Boulder, Colo., on Dec. 26, 1996.
Karr told investigators he
drugged and had sex with the child beauty queen before accidentally killing her, said a senior Thai police officer, who was briefed about the interview.
http://hosted.ap.org/dynamic/stories/J/JONBENET_RAMSEY?SITE=FLPAP&SECTION=HOME&TEMPLATE=DEFAULT&CTIME=2006-08-17-09-48-53
http://www.thesmokinggun.com/archive/jonbenet1.html