ARCA after hours newbie question

I supposed that if I'm the first one to offer my shares they will be bought first if me and someone else offer shares at the exact same price. Right?
 
When a sale order goes to ARCA after hours, is it reviewed by someone before it goes public?
Well it may be reviewed by your brokerage compliance department (especially for short sale orders) before it goes live. Other than that I don't think anyone else has access to your order before it goes live to the public.
 
Well it may be reviewed by your brokerage compliance department (especially for short sale orders) before it goes live. Other than that I don't think anyone else has access to your order before it goes live to the public.
Can you explain that further about review of ah shorts?
 
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