Comment This is only a partial solution (Score 1) 145
It at least protects the parties from possible physical harm. But it's still quite possible to get taken for a ride--in a police station.
Even when doing business with someone you don't know, it's possible to look for, and read, clues as to the kind of person you are dealing with. Do they call back when promised? Do you notice any "little lies"? Does the story change over time?
I've bought personal vehicles on Craigslist for years, and there are a lot of good clues. For example, when you ask whether the car is still for sale, and they answer "Which one?" you know you're talking to a dealer, not an individual. Ask lots of questions, then mention that you will be pulling the CarFax report, and watch what happens. If they start changing the story, walk away! Clues as simple as how the person dresses can tell you a lot about what kind of person they are.
No system is perfect, but it's important to do your homework, even if you are meeting in a police station.