What about boyfriends, girlfriends, acquaintances, coworkers or uncles who opt not to say what is in their pockets before getting into your car? Do you search everyone before they get in your car? How would you have any control of that?
If you’re asking what I’d do personally, it’s a matter of my self-interest versus their self-interest. Which makes it pretty easy to be cold-hearted about choosing one’s friends, and which relatives or coworkers to trust, much less allow in my vehicle. When in doubt, I’d call a cab and give him/her a 20 for the ride. And not apologize about it. The cabbie has a legal out.