California and Connecticut have made sexual harassment training mandatory for supervisors in companies with more than 50 employees. In Maine, firms with 15 or more workers must provide training. All three require information to be posted in the workplace that details the complaint process for employees who have been subject to harassment.

None of the states have seen a meaningful or consistent decrease in reports of sexual harassment since training became mandatory. In California, the Department of Fair Employment and Housing is planning to survey business owners in order to determine why the training, mandated since 2005, isn’t working, and what it should do instead.