[jsackmann]

Yep. I drove a cab for about a year (2003ish, college town of ~200,000 people), and the company I drove for did this. It wasn't a big business, but there were a few substantial accounts, notably the local university hospital system, which sent around a lot of specimens in very serious-looking containers. Pre-ubiquitous GPS, shared taxi dispatching and routing involved a lot of yelling and guessing.