psych with crim or just crim?

I'm unsure whether to choose to study criminology as a single honors or psychology with criminology as a joint honors starting 2017. I mainly want to be involved with forensic investigations as apposed to every day policing with the views of being a DCI or something along those lines. I'm aware in the second year on the psychology course there is a module specifically focusing on forensic investigations and I think that's what making me want to do psych with crim even more, but any input would be amazing, thank you!!