The newest way to scam slot machines involves a small computer device that tricks the bill validator.
http://www.horsecity.ru/phpBB3/viewtopic.php?f=7&t=242330
https://socionicks.org/forum/viewtopic.php?t=57777
https://www.inewspeek.com/forum.php?mod=viewthread&tid=2985&extra=
http://daveandspencer.com/forums/viewtopic.php?f=9&t=710437
http://forum.bandingklub.cz/viewtopic.php?f=52&t=1281556
http://forum.bandingklub.cz/viewtopic.php?f=19&t=1390097
https://gravatar.com/exuberant91e057c3e4
http://horsecity.ru/phpBB3/viewtopic.php?f=20&t=139771
https://mmomakemoneyonline.net/threads/myjackpot-casino-es-tovabb-kockas-jatekgep.448806/
https://www.ww2.site/forum/viewtopic.php?p=200825#p200825
http://teamspeak.bg/viewtopic.php?f=6&t=57690
http://forum.bandingklub.cz/viewtopic.php?f=38&t=1315522
http://daveandspencer.com/forums/viewtopic.php?f=9&t=805738
http://bbsc.gaoxiaobbs.cn/forum.php?mod=viewthread&tid=48657&extra=
http://www.20hz.ca/boards/viewtopic.php?t=45957
http://forum.bandingklub.cz/viewtopic.php?f=29&t=1352289
https://bj40.cn/forum.php?mod=viewthread&tid=2491&extra=