"If you have a trusted friend or relative that lives very close by, have them keep a camcorder or camera handy and remain vigilant. If the fedgovthugs show up, have them videotape the entire event (without sound) from concealment. "
CF:
Get it straight guy. In Maryland, it is illegal to tape a telephone conversation. NOT to tape the voices in your office!!!!! Why do you think that people put you on the speaker BOX!!! My recorder picks up the voices in my office. LET'S GET THE INFORMATION STRAIGHT AND REALLY HELP THESE FOLKS. Cops record you when they pull you over."
"Are you dense!! I [sic] a public place you can tape and record. Let's get straight information out!!!"
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Yes, let's not be 'dense', and let's give out correct info.... unlike the false and dangerous advise you have given here.
In the state of Maryland, the thin line between legal recording and felony illegal recording is 'a resonable expectation of privacy'. If that reasonable expectation of privacy does not exist, then you must have prior consent of all parties involved, and you (the person making the recording) must be a party to that conversation. If the conversations you record in your office are done without the prior knowlege and consent of everyone involved, including those on the other end of the phone line; and your office is in Maryland; then you have just admitted commiting a felony on a public internet forum, which can get you up to five years and a $10,000 fine. That's not too bright, Sparky. So are you the one to be dispensing legal advise here ??? Perhaps not. 
If you are a Maryland resident, your neighbor is filming the cops serving a warrant, and they run to a side window of their house, videotaping the cops in your house through an open window, and their camcorder mike picks up some of the conversation, your neighbor has just committed a felony. Your home is a private residence, thus a reasonable expectation of privacy exists there. Your neighbor is taping conversations he's not a party to, that he lacks prior permission of all participants to record, thus the recording is felonious. This is why I recommended that people forego the audio; the line demarking a felony crime is so easy to accidentally cross when your mike is open and recording everything that it's better to play it safe.
As for recording from concealment, yes, it may be prefectly legal to stand in your front yard and tape the cops serving a warrant on your neighbors. But in many such cases, the cops have walked over to the person taping and seized the tape, or prevented further taping. Yes, it's illegal for cops to do that, but cops know they will personally suffer little or no consequences for that act, and don't much care about the law in that case. Never underestimate the arrogance of fedgovthugs; history clearly shows they feel they are above the law.
So in the future, perhaps you should be a little better informed before you run your mouth, hmmm ??? You might want to check out this link....