Do you live in a place where carjackings are common enough to justify making it impossible to give a random friend a ride, somewhere, on short notice? If you d

Do you live in a place where carjackings are common enough to justify making it impossible to give a random friend a ride, somewhere, on short notice? If you do live with that kind of fear of violent crime in your life, I legitimately offer you my deep sympathies... I've had the privilege of living most of my life in physically very safe places, and I can only imagine how awful this would be. That said... Individually authenticating passengers in the car would require some extensive, invasive technology. I cannot imagine an effective way to do it... Here in the US, people convicted of drunk driving are often required to install ignition-interlock Breathalyzers as a condition of keeping their driving privileges. But even those systems are pretty trivial for a somewhat determined problem drinker to defeat. Also, the major loss of functionality (giving rides to people on short notice) would make it a hard sell, except in place where the crime problem was truly terrifying... And at that point, I'd assume that it's easier/cheaper to just hire armed bodyguards to escort you, rather than any kind of technological solution.