Joseline Hernandez Says She's Drug-Free but Stevie J's Not Buying It

Joseline Hernandez says she has hard evidence she's clean and sober, but her soon-to-be baby daddy, Stevie J, is not buying it.

Joseline filed docs and attached 3 drug test results that show she tested negative for various drugs -- including cocaine, amphetamines and weed. She also attached a note from her care provider stating she's had a healthy pregnancy.

In the docs, Joseline says she voluntarily submitted to the drug tests, and Stevie's claim she's abused drugs throughout her pregnancy is a sick ploy to embarrass her.

Joseline clapped back with a shot of her own -- Stevie's $5,000 check for her medical costs bounced, according to docs.