The mystery began in late December as investigators brought Graham, 31, of Fort Pierce, to the St. Lucie County jail on a robbery charge, according to an arrest affidavit.

Graham told officials she had no contraband on or in her.

An X-ray scan, however, helped reveal a “small object” in her pelvic region.

Given a change of clothes, Graham was scanned again.

“The same object was visible on the X-ray,” the affidavit states.

Graham was taken about 5 miles away to Lawnwood Regional Medical Center & Heart Institute where investigators said she agreed to a body cavity search, which is a search of body cavities and a promising name for a heavy metal band.

Additional X-rays were taken before a doctor extracted from her vagina “a small glass smoking pipe, commonly used for smoking crack or other illegal drugs,” the affidavit said.

Mystery solved.

How the pipe got there wasn’t disclosed.

Graham was arrested on additional charges of possession of drug paraphernalia and the introduction of contraband into a detention facility.