Are you also fascinated by TV shows like Sherlock, CSI or Criminal Minds? Do you ever wonder how those characters end up being such smart detectives or lawyers? The study of criminal law, including phycology, is what makes these guys appear so interesting and admirable. Maybe that's what compels you to look for criminal law books that you can buy.
The reality though might be a bit different from these shows, and if you have already studied this trade you would know that. A majority of your time goes studying and analyzing documents instead of doing all those exciting things that you watch on TV. So now that you have gone through all those procedures a thousand times already, you feel like you do not need the books that you have and are looking for ways to sell it.
Studying criminal law enables you to seek employment at various departments, be it law enforcement, for example, being a detective or a payroll officer, or be it the judiciary, where you can be a lawyer or an attorney. As this is a highly sensitive area you'll be working with, it requires a lot of skilled and capable professionals. The books that you are going to buy or sell might just have a great impact on this.