Radley Balko writes that he learned this from Gene Papet, a professional trainer of K9 unit dogs.<p><a href="http:&#x2F;&#x2F;www.huffingtonpost.com&#x2F;radley-balko&#x2F;supreme-court-considers-t_1_b_2063820.html" rel="nofollow">http:&#x2F;&#x2F;www.huffingtonpost.com&#x2F;radley-balko&#x2F;supreme-court-con...</a>