She's testified in countless court cases, including the Ricky Holland murder trial, as a state forensic scientist.
But in court for her own divorce, Ann Chamberlain admitted to using her job as a state forensic scientist to find out if her husband was cheating.
It happened last September, according to court documents.
Formerly Ann Chamberlain-Gordon, the 33-year-old Okemos woman says she performed DNA tests on her husband's underwear.
She says she found another woman's genetic material.
After an investigation into what a Michigan State Police statement calls "violations of department administrative policy," Chamberlain lost her job, effective August 16.
None of the documents obtained by News 10 indicates specifically that the testing was done here at the forensic laboratory where she worked, but Chamberlain testified in court that she used expired supplies from her workplace to perform the tests.
Chamberlain says she did it on her own time, but according to state police policies, any "supplies, materials or equipment" can't be used for non-duty or non-department purposes.
Although she's lost her job with the state, a Williamston forensic science consulting firm confirms Chamberlain is still employed there.
Her attorney could not be reached for comment.