| A purchase means ownership of the item transfers to the buyer unless stated contractually.  Rylss is correct, the police have the right to take anything they need as evidence of a crime and hold it until no longer needed for the case or ordered to release it by a judge.  The district attorney also has a say when evidence can be released.  Having worked for department store security, I can't think of any way the store would have any say in it. 
				__________________A little rudeness and disrespect can elevate a meaningless interaction to a battle of wills and add drama to an otherwise dull day.  Calvin
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