The TSA Agents are shall we say inconsistant in their enforcing the rules, on what is allowed, not allowed on your person, and carry on baggage.
My neighbor who is still doing consulting has said it many times, it not flying that bothers him, it's deal with the TSA Agents who sometimes don't understand what is allowed, and what is not allowed to be carried in carry on bags.
Nice part about auto travel is no one tells me what I can pack and take with me.