Comment Re:Refuse the search? (Score 5, Informative) 923
This raises another question. What happens when these people refuse to answer questions or allow a search of their home?
IANAL, but I've done quite a bit of reading about this topic. The rule (at least in the US) is very simple: You are not required, nor should you allow any law enforcement officer into your home or business without a search warrant. Needless to say, you should not be talking to them at the front door either. They are not going to bust your door down, and it's likely they will not return.
Keep in mind that you should never talk to a federal agent without your attorney's advice. The reason? It is a federal crime to lie to a federal agent, and there are many cases of people being charged with lying rather than the original crime for which they were being investigated.
Don't take my word for it. Read the words of a former government attorney (scroll down to "The Raid"). There are any number of good articles and videos authored by attorneys. Here's another one that's worth a read.