State statutes tell you what the law is ...
These Books from Bloomfield Press tell you what it says.
Missouri's Concealed Carry Statutes are in
Permit to PURCHASE a CONCEALABLE weapon Missouri Revised Statutes - Chapter 571.090Exceptions to concealed carry prohibition Missouri Revised Statutes - Chapter 571 .030
Be advised - there are numerous other firearms statutes
on gun laws and other topics.