A Salt Lake woman has been charged with aggravated robbery after she brandished a bloody needle-tipped syringe, claimed she was infected with the AIDS virus and demanded money from a food store clerk.

Lisa Elaine Lahr, 29, was charged in 3rd Circuit Court Wednesday with aggravated robbery, a first degree felony,Police said a woman walked into Dan's, 2336 E. 2100 South, about 9 a.m. last Thursday and purchased some cigarettes at a checkout counter. She mumbled something, but the clerk didn't understand and asked the woman to repeat it, according to a report.

"The suspect leaned closer and said she had AIDS, showed the clerk a bloody hypodermic and told her to put money in a bag or she would stick her," the report said.

Lahr admitted to police "that she had indeed threatened (the clerk) as described and taken the money," the documents say.

Salt Lake police have arrested Lahr in the past for investigation of prostitution and possession of drug paraphernalia charges, according to 3rd Circuit Court records.