Senator arrested outside Ferguson PD

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(06-28-2016, 06:15 PM)bfine32 Wrote: But she had a permit.

I must really be out of the loop as the OP asks Why they took her gun when they arrested her. Is it common practice to allow folks to keep their weapons when they are arrested?

Nope.
I believe that in most states they can keep it for 24 hrs, if they ask for or take it from an individual, even without the person commiting a violation.