Have you ever been stopped, harassed, asked for a look inside your vehicle for no reason? Unlawful things happen, you may start protesting right now.
It’s our personal interest to refuse searches (and asking for a reason why it’s performed is a good start to halt it, they use all kinds of tricks to make you submit voluntary). There was an article linked somewhere in the comments, a guy had traces of cocaine on his luggage and refused to unlock his phone. He’s got 2 days in detention and $500 fine. If they had his data, who knows, he could’ve been arrested, indicted, gone through a criminal process, may be jailed and fined up to $25,000.