I'm not going to lend my truck to my brother while he is high.
Is there a reason you don't trust him with the truck?
The truck was a gift from a close a friend, and he might wreck it.
It sounds like a good idea to not lend him the truck especially since he isn't sober. I don't think anyone can blame you for not wanting to loan a vehicle to someone who isn't sober enough to drive. Maybe just tell him to come back when he sobers up.
I'm glad you didn't think I was being uncaring.
No, I think your being wise. Your brother might have a substance abuse problem. He shouldn't think it's OK to drive a car when he's high.