The woman gave that bag to her attorney, who took it to a crime lab, prosecutors said.
Tests would come back positive for Jones, who prosecutors announced on Friday would face charges of engaging in sexual activity with a confined adult while acting as a peace officer employed in a public detention facility and dissuading a witness from reporting a crime.
Prosecutors say that although charges have been filed, the case remains under investigation.
This is also the second former deputy to be charged with sexual misconduct this week.
Another deputy was charged with battery Monday after prosecutors said she unlawfully touched an inmate’s breasts.