A Georgia woman spent more than three months in jail on drug charges after sheriff’s deputies mistook congealed cotton candy they found in a car she was riding in for methamphetamine.

A state crime lab eventually showed that they were wrong. Now, she’s suing.

In the lawsuit, filed this month, Dasha Fincher alleges that she was wrongfully arrested and incarcerated in December 2016, when she and her boyfriend were pulled over by Monroe County sheriff’s deputies. The deputies found a blue, crystal-like substance in a bag on a floorboard in the car and evaluated it using a roadside test kit, which seemed to confirm that it was methamphetamine.

Ms. Fincher said it was most likely two-day-old cotton candy discarded by the children of her friend, from whom she had borrowed the car. The next thing Ms. Fincher remembers, she was in handcuffs.

“I knew it was cotton candy, and for him to come back and say it was meth, I really didn’t know what to say,” she said in an interview on Wednesday. “I kept thinking, ‘This is crazy, I’ll get out tomorrow.’ Then when I wasn’t out by Sunday, I said, ‘It’s a holiday weekend, I’ll be home Monday.’ Then every day turned into ‘I’ll be out tomorrow.’”