What country/state/county is your recommendation from? That
In most states, you can legally carry cannabis paraphernalia with a medical marijuana recommendation. But don't take that information at face value. It's important to remember that even with a recommendation, you are NOT allowed to drive under the influence of medical marijuana. If you are caught driving around town with a dirty bong in the cup-holder, you will have problems explaining that you aren't DUID. If you have a pipe in your house, you're home-free.