The "law" is that you must always have a picture ID on you at all times, whether it is a driver's license or state ID card. Now this is barely enforcable unless you get detained by officers. The truth is that if your license is suspended, and you aquire a state ID card so as to comply with the "have ID at all times" law, then you must re-test to reaquire your driver's license once the suspension ends. Obviously very few people will take the state ID route, but rather they wait it out and get their license reinstated. You can not hold each ID as valid concurrently. This is my personal experience.
"The "law" is that you must always have a picture ID on you at all times, "
Would you give us a reference to this law please?