If you came into my house armed, you will become family. Some people aren't that friendly towards us. I have a former friend who, when he learned I was a CCW permitee, no longer talks to me. I couldn't care less, but in some relationships, you need these people on your side. Doctor is one of those.
Also, don't even THINK about carrying on ANY Federal property- meaning court houses, Post Office, military base, etc. I forgot what the statute is, but anyone can look that up easily. Check this out:
Concealed-carry in a post office may lead to rude awakening
and this one
Firearm in Vehicle in Federal Parking Lot
On a local level, consider buying a law book for your home library (if legal in your state). Otherwise, copy the laws onto your computer AND a flash drive on your keychain...
I hope this helps someone...