Seattle Mariners. His swing, which is very balanced and natural, moved him up in the Mariners' lineup to hit in the coveted third spot during May 2007. Guillén helped the Mariners return to the playoff hunt in 2007 after not making the playoffs since 2001. In 2007 it was reported that in 2003 Guillén had had performance-enhancing drugs sent directly to him in the Oakland Coliseum. Kansas City Royals On December 4, 2007 Guillén signed a 3-year, $36 million contract with the Kansas City Royals. His signing moved Mark Teahen to left field, and Billy Butler to first base. He was suspended for the first 15 days of the 2008 season on December 6, 2007 just hours after passing his physical exam. His 15-game suspension was rescinded on April 11, 2008; after the MLB Players' Association and MLB owners agreed on modifications to the current drug testing program. As a result of the agreement, all players implicated in the Mitchell Report were given amnesty. In a game on August 26, 2008 in Kansas City against the Texas Rangers, Guillén was involved in a confrontation with a fan in the stands just past the Royals dugout down the first base line. He made vulgar gestures and yelled profanity at the fan who had reportedly been heckling him for his lack of hustle. His coaches and teammates had to restrain him as he made his way towards the fan. The fan was removed from his seat. On May 21, 2010 Guillén got his 1,500th career hit in Kauffman Stadium against the Colorado Rockies. On August 5, Guillén was designated for assignment. San Francisco Giants On August 13, 2010, Guillén was traded to the San Francisco Giants for cash and a player to be named later which turned out to be Kevin Pucetas. But shortly after joining the Giants, he was placed on their restricted list for postseason eligibility because he was being investigated for performance-enhancing drugs. Alleged use of performance-enhancing drugs Guillén was linked to performance-enhancing drugs in the Mitchell Report. He was suspended for fifteen games in 2007, but was granted amnesty like all other players mentioned in that report. In 2009, he acknowledged that he had worked "for many years" with Angel Presinal, a personal trainer closely linked to performance-enhancing drugs and who is currently banned from major league clubhouses. But he claimed he hadn't worked with Presinal since 2004