Stahl has also written a number of "" episodes which deal with transgressive topics and have been some of the most controversial but also gained some of the highest ratings. He introduced the dominatrix character Lady Heather, who has appeared in a number of episodes, the first of which, "Slaves of Las Vegas", featured viewer discretion advisory warning, due to nudity and sexual content. Stahl has been criticised for his inaccurate portrayal of furries in "Fur and Loathing". However, while earlier episodes of CSI had been criticised for the treatment of transgender people, his episode "Ch-Ch-Changes" was highlighted as offering a sensitive portrayal of the topic. It also got the largest audience to date, 31.5 million, with his "" being the second most watched that season. That episode dealt with infantilism and the Parents Television Council declared it was the worst television show of the week.