HADLEY MA Jan 17 2018 — Prosecutors painted a squalid picture of what went on inside the little house on busy Russell Street: The Asian women were kept there night and day, providing sexual services for a fee, sleeping where they worked, and rarely venturing outside except to take out the trash.

The customers themselves led law enforcement to the address in 2016, by writing detailed reviews of the services they received at Hadley Massage Therapy — services that went far beyond massage. On a controversial website called Rubmaps.com, they described their sexual experiences in detail, including how much they paid, what services they received, and their level of satisfaction with the women’s performance.

“These are reviews on victims of human trafficking,’’ said Massachusetts Attorney General Maura Healey, whose office led the investigation into the alleged sex traffickers who ran centers in Hadley, East Longmeadow, and Framingham. “It’s terrible, their depiction of women. . . . It’s just truly appalling.”

The now-closed Hadley Massage Therapy is one of hundreds of erotic massage centers described on Rubmaps.com in Massachusetts alone — and there are some 7,000 nationwide.

But even though law enforcement officials can easily find other suspected sex-trafficking operations on Rubmaps.com and other so-called John boards, listings on these sites seldom lead to prosecution.

That’s because of the sheer number of businesses and the legal resources needed to take each one down. Shutting them down is not as simple as rounding up the men and women in the massage parlor. State and local officials say they don’t want simply to arrest women workers — who are increasingly considered victims — but to take down the business operators who often run multiple storefronts.

Healey said her office will continue to go after the massage businesses described on the review boards. But even when law enforcement moves against erotic massage parlors, conviction of alleged traffickers is no slam dunk. The women, many of them fearful of deportation and unable to speak English, often make reluctant and poor witnesses. After being questioned, they often leave the state. The New England Center’s efforts to reach alleged victims from recent busts proved unsuccessful.

Donna Gavin, head of the human trafficking unit for the Boston Police Department, said police scrutinize review boards during investigations when they get tips about problematic addresses. But they have to be selective because investigations can be labor intensive, she said.

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