SALISBURY, Mass. (WHDH) -- A Salisbury man has been charged with pretending to be a doctor so he could videotape women as he examined them.

Prosecutors also allege 44-year-old David Anderson secretly videotaped nude 10 to 13-year-old daughters of friends and relatives in his Salisbury summer home.

Police say Anderson recruited women through Craigslist and offered $25 to $50 to be examined by medical students for research.

“Apparently he had a rouse set up where he posed himself as some type of health care provider soliciting women for research -- exams for research -- but then he required them to conduct what he would call a baseline examination which he also videotaped,” said Chief Tom Fowler, Salisbury Police Department.

Authorities say Anderson may have fooled at least 20 women over several years.

“It does not look like a real set up but he did have a stethoscope, blood pressure cuff, things that may lead people to believe he was at some level of a health care provider,” said Chief Fowler.

Anderson is being held on $500,000 bond.