Well, you can't have it both ways.
1) He knows better than to break the very specific conditions of house arrest by having a gun on the property, because he's LE.
or
2) He's careless with where he puts his weapon because he's LE and he's used to having it around.
One trumps the other. IF he wants his daughter to remain in his house.
I have a handgun, too. But I've never hidden it in the sparetire well of my vehicle. It's obvious he was hiding the gun and he didn't think the gun would be found. Sounds to me like the option number 1 above is more correct than option number 2, because he knew he wasn't supposed to have the gun there...ergo he hid it in a place that would not help him, for "safety" reasons.