Updated

After a week of testimony, the lead investigator has taken the stand in the trial of a Maine man accused helping a fitness instructor use her Zumba studio as a front for prostitution.

Kennebunk police officer Audra Presby testified briefly Thursday and returns to the stand Friday in the trial of Mark Strong, who faces 13 counts related to promoting prostitution.

On Thursday, jurors watched a video of a sexual encounter that showed money changing hands and additional videos suggesting Strong was familiar with the operation.

The prostitution scandal attracted attention after it was reported that fitness instructor Alexis Wright had ledgers indicating she made $150,000 over 18 months.

Strong and Wright have pleaded not guilty. She'll be tried later.