Yes, there are often a few different options for criminal justice. You can focus on the forensic side of things (think finger prints, dna testing etc) that often are heavily science based. There are also majors on the legal side of things like criminal law etc in which you could become a lawyer, or still do a more criminal justice type role. There is also the more generic criminal justice major that encompasses everything. If you go to a school that specializes in criminal justice you can also find very specialized degrees such as large cases, federal criminal justice, criminology, behavioral science etc.