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PRK? What about law enforcement do you think we could get one?
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California...People's Republic of Kalifornia. As far as LEO, that is a good question. I would assume they would only let you purchase one with a department approval if at all. Which means you have to get your department to approve the purchase and have a written statement stating such. More likely, they would make your department purchase it for official use.
Being an LEO still doesn't entitle you, unfortunately, to purchase a restricted item for personal use and I doubt a dept. would authorize such a purchase for personal use either. The best thing to do is both contact Surefire to see what their policy is and to ask your dept. supervisor what its policy is.
That being said, the SF can is, as yet, unproven. I wouldn't believe all the hype of the article until independent use and testing had confirmed any or all its claims. There ae plenty of suppressors out ther that are great performers, proven, and available for private purchase.