The answers so far are assuming you are on probation/parole. If this is true, and they did, in fact, receive phone calls saying you were involved in narcotics, you are pretty much SOL.
If you're not on probation/parole, then they conducted an illegal search. Anything they found is inadmissible against you, and you may even have cause for a civil suit against the City/County.
When you are on probation/parole, you agree to be subject to search and seizure by law enforcement at any time without a warrant or probable cause. This, in effect, amounts to a waiver of your 4th Amendment rights (although I personally disagree, the word "waiver" has been used in case law).
Therefore, they need no warrant. However, this does not remove all protection. I'm sure there is some case law in your state that says that searches of probationers/parolees cannot be "arbitrary or harrassing" (or similar language). If there were no phone calls, the search may be invalid.
Your story, unfortunately, does not necessarily require that they Mirandize you either. A Miranda reading is not necessary until you are in custody.
"they made me and my husband stay at the other end of the trailer" - HAHA! But seriously, you're not really in custody at this point.
You don't say if they found anything. If they didn't find anything, this isn't really an issue anyway.
The lawyer doesn't determine it. They are merely your representative as to the laws in your jurisdiction.
A judge will decide unless you opt for a mediator and can come to an agreement (also depending on where you live).