The body of Le, of Placerville, Calif., was found stuffed behind a research lab wall on the day she was supposed to get married. She was 24.
Hromadka, who worked at Yale, hasn't been charged, and police said Monday they don't expect to make any more arrests in the case.
Hromadka's attorney, Robert Berke, said Monday authorities have not provided him with the test results. He said there have been no communications in recent months between investigators and him and police have not tried to interview Hromadka recently after he turned them down early in the case.
Berke has said he had been told Hromadka was not a suspect.
Police say Clark's DNA was found on a pen under Le's body and his and Le's DNA was found on a bloody sock.
The warrant was obtained to compare DNA on Hromadka's ID lanyard with DNA on the sock and pen.
The tests of Hromadka would prove whether she is the source of DNA obtained from the pen, sock and lanyard, authorities said in the warrant.
David Foran, director of the forensic science program at Michigan State University, said if the DNA came back as Hromadka's the key issue for police would be whether she had a legitimate reason to be in contact with the sock or pen.
A telephone message left Monday for a prosecutor wasn't immediately returned.
Clark and Hromadka were seen leaving a coffee shop in a car in which "blood-like stains" were found hours after Le was killed, according to search warrant affidavits unsealed in December.
Hromadka did not use her electronic key card to access the building where Le's body was found from the time Le disappeared until she was found five days later, according to the warrant. But the warrant says employees assigned to the building where the body was found access the building by following behind other employees without using their own cards.
Autopsy results show Le was strangled, but the motive remains unclear.
Clark, 24, has pleaded not guilty to murder charges.