If you are ever asked by law enforcement officials for permission to search anything, our best advice is to say "no", and ask for your attorney. Each of us has the Constitutional right to deny a search that is not called for by a warrant. We also have the right to remain silent and the right to have a lawyer. If you say "no", consent can be sorted out later. But if you say "yes", you waive your Constitutional right. What's done cannot be undone.