The 4th Amendment
The Fourth Amendment to the U.S. Constitution places limits on the power of the police to make arrests, search people and their property, and seize objects and contraband (such as illegal drugs or weapons). These limits are the bedrock of search-and-seizure law. This article covers basic issues you should know, beginning with an overview of the Fourth Amendment itself.
You can get a lawyer or you can plead the fifth...right to be silent. Check out the 5th amendment in the Constitution. The answer's right there.