Short Answer:
Any thing you are caring that will make you less vulnerable to the criminal element will probably make you illegal as well.
Exceptions:
In places like that I carry a walking cane (hasn?t your knee been bothering you lately?) Do a search to get the latest information but most stuff I would want with me would not be OK with the KGB of DC
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When the wolf attacks he will find that some who run with the flock are not sheep!