At a hearing Tuesday, prosecutors asked for and received permission to get dental impressions of the 49-year-old detective. Prosecutors say Rasmussen had a bite mark on her left inner forearm. They want to compare Lazarus' teeth to the wound.
Prosecutors say Lazarus's DNA profile matches a swab taken from the bite.
Lazarus is a 25-year veteran of the LAPD who worked primarily on art forgery cases. She was arrested last month by detectives who worked in the same building as her.
The Associated Press contributed to this report.