be tight for tomorrow's annual marathon. massachusetts' governor says there will be a consider -- be considerably larger police presence. the bombing last year left 260 injured. back to msnbc "undercover." san francisco police, can you open the door, please? >> in 2010 the city of san francisco finally succeeded in closing down sunflower. a notorious hot spot for prostitution, masquerading as a legitimate massage parlor. >> they were closed. the owner left. the owner of the building rented the facility to somebody else. we had a moratorium on that location. we're not going to issue massage permits there. all the potential human trafficking at that location. >> unable to get another city permit for a massage establishment, the new owners at