can you not just put it in your glovebox? they cant check your glovebox or trunk if they are locked from what i've been told...
another trick is to buy a shitty one and a good one... if u get pulled over, hand in the shitty one and take the loss... keep the good one and put it in your glovebox, they would never suspect you have two
and i agree, the have saved my dad's ass numberous times!! definately worth the investment if your safe!