Here's the beauty of the alerts...they are in a text format, and amber alerts (as research has shown) are most effective in the slowing or stopping the movement of the parties involved and the child who the amber alert reflects. Again...a TEXT format notification while you are driving. Now here you are, driving down the road and you get the amber alert (or severe weather alert, or whatever government alert is sent out), and Johnny Law is there beside/behind/around you and sees you look down at your phone...OH SNAP! He's TEXTING!
Blue lights on...badda bing, your word against his. There are pieces of the law that exempt people who are "responding to an emergency", which any good lawyer could argue for you and win...but the percentage of people who lawyer up for traffic citations is very low (and that is why so many ridiculous tickets are written, just FYI).
Seems to me like the best option for these things is to just be turned off...especially at 2am, when they send you an amber alert for a child that was abducted some 5 hours away going in the total opposite direction of where you live. Who needs good sleep anyways?