The woman accusing NFL line judge Carl Johnson of domestic violence was a police officer in Louisiana for more than 5 years ... TMZ Sports has learned.
Here's what we know ... the 49-year-old female accuser was a detective for the Thibodaux Police Dept.
We spoke with the accuser who says she worked on a famous murder case back in the early 2000s.
The accuser resigned from the force in 2002 after filing a complaint with the Equal Opportunity Commission that she was sexually harassed by a superior officer.
We've called the TPD multiple times about the matter -- but have not received a call back.