Should I allow police inside?

The police are at my door right now and they want to search the house. Should I allow them inside?

No. 

Instead, demand a warrant. This requires that the police go to a judge and show probable cause that evidence of a crime is in the house, and they must be able to detail what that evidence is. If you consent to a search without a warrant, you will lose your right to challenge the search in court. Warrants can only be issued using “reliable” information. If the search is illegal and not based on credible information, you can bring a motion to suppress as evidence anything that was taken, meaning it will not be allowed at your trial.

Even if you think you have nothing to hide, you have nothing to gain by consenting.