The old Hazmat channel has been removed from the database, so I'm guessing it will disappear the next time your Home Patrol updates. And just a little further clarification... it isn't an encrypted channel. It's just one of the pool of frequencies used on that site. When LPS uses it, yes... it carries digital encrypted traffic. But if it gets assigned to any other user (works, fire etc) then you will hear normal analog traffic. That frequency is no different than any of the other voice frequencies in use.
For me, that's the biggest problem of the Home Patrol... You are at the mercy of a public database which may or may not be up to date and correct. That feature alone is the main reason I won't buy one. Once software comes out that let's me tinker with things to my liking, on my own, then that might be a different story!