Does anyone know Florida law on this? Can they picket the house on the street?
In general, the First Amendment protects protesting on public property. It does not have anything to do with Private Property and no one has a constitutional right to protest on private property if the owners do not permit it. No Tresspassing signs can serve as the requsite warning that access is nto permitted and the LE can be called ot enforce property rights. Also, the government/LE can place restrictions on the time, place and manner of a protest to, for example, protect public safety. So, they could keep protesters on public property which may be difficult in a residential neighborhood-they may have to go to a nearby park, for example, if they impeed traffic flow or present a risk to public safety.
I'm not sure where LE is on this issue here-they may want the pressure applied by a protest but they may also fear any resulting injuries which could be viewed as forseeable so that there should have been restictions placed. It's like at the party conventions where there are designated "protest" areas-this is for reasons of public safety.
By the way, I've been lurking for quite a while but don't have a lot of time to post. I'm an attorney, but not one relevant here-I'm in house at a large financial institution. I do work frequently with former LE who are in our large Corporate Security department so I am familiar with interrogation and investigatory techniques and we also often work with the FBI, Secret Service and state and local LE on internal and external financial crimes.
You all seem like really caring people here-many who have suffered through terrible circumstances. How nice that it led you all to adding your efforts to finding the missing. These missing children cases just pull at your heartstrings-hope that sweet little girl can be brought home.