Susan Light and Timothy Bolinskey, a man identified as Light's boyfriend, both filed a misdemeanor assault charge against each other in October.
Their trials were held simultaneously Tuesday morning, but both cases were dismissed because they chose not to testify in either case.
"We called these individuals as witnesses and they exercised their Fifth Amendment right and refused to testify," Wise County Commonwealth's Attorney Chuck Slemp said. "Because they are also complainants, their cases had to be dismissed because there was no evidence."
Light is still facing another charge in Tennessee. She was arrested in Sevierville on Dec. 11 for domestic assault.
The officer said he witnessed a man identified as Light's boyfriend, Timothy Bolinskey, standing over a small pool of blood on the floor and holding his finger. The affidavit says Bolinskey told police they were arguing and Light bit his finger and smacked him in the face.
Bolinskey was also charged with domestic assault in that incident.