Even without the mushroom use, I would expect to have to wait more than the five or seven years you'll be in college. With most things the longer you wait the better. Since there is no way really to tell what a police department will do in four, five, ten years from now your best bet is to hedge your education to your benefit. If you are interested in LE there are many opportunities for work in private industry that the CJ degree will not get you with out either more education or job experience.
My advise: Instead of going for a single major of CJ, You can either double major or have a major/minor. Either way complete the CJ requirements while completing something in finance, business, or IT. All three disciplines are not normally seen with a CJ education, it will set you apart. Also all three disciplines will serve you well in LE, if you are able to go that route. They also open you up to many corporate security type jobs (not a security guard either) paying high five and low six figures.
But when a long train of abuses and usurpations, pursuing invariably the same object, evinces a design to reduce them under absolute Despotism, it is their right, it is their duty, to throw off such Government, and to provide new guards for their future security.
Translation for the intellectually challenged: If the government screws the people too much, it is the right and duty of the people to revolt and form a new government.