Background: Placebo is an alternative rock band, formed in London, England in 1994 by singer-guitarist Brian Molko and guitarist-bassist Stefan Olsdal. The band were soon joined by drummer Robert Schultzberg, who left in 1996 due to conflicts with Molko and was replaced the same year by Steve Hewitt. Placebo gained exposure in 1997, after releasing "Nancy Boy", a song which Brian Molko described as "obscene". The band has sparked controversy at the beginning of their career because Molko wore dresses and make-up in public and talked openly about sex, sexuality and drug use.
Context: Despite initially being considered a glam rock act, Placebo's music developed throughout their career, adopting diverse elements from other genres. Besides the alternative rock and glam rock classifications, critics have described the band as goth-rock, Britpop, pop punk, post-punk revival, electronic rock, experimental rock and industrial rock. Progressive rock elements in the band's earlier works along with grunge and punk rock influences were also noted.  Placebo's influences include David Bowie, Can, Iggy Pop and the Stooges, Sonic Youth, The Cure, Pixies, Nirvana, The Smiths, PJ Harvey, Depeche Mode and Nine Inch Nails.  Lyrically, Placebo's music contains many references to drugs and LGBT themes. The title of the song "Special K", for instance, is slang for ketamine. Molko has been open about his use of recreational drugs: in a 1997 interview with Kerrang! magazine he admitted that heroin was "probably the only drug on this planet I haven't tried". However, he later admitted to using heroin as well. Pharmaceutical drugs are also referenced, as evidenced by the band's name as well as the album Meds and its title track. Molko admitted in 2003 that many of his initial excesses were due to his mental issues; he was officially diagnosed with major depressive disorder in his late twenties. The singer claimed in 2016 that he gave up drugs completely after the recording and release of Meds.  Outsider themes are also explored, as evidenced in lyrics such as "the back of the class is where I'm from" on "One of a Kind" and "I'm forever black-eyed/A product of a broken home" on "Black-Eyed". Molko has been quoted as calling the band "for outsiders, by outsiders".
Question: What substantiate this claim for their music?. Whats the answer?
he admitted that heroin was "probably the only drug on this planet I haven't tried".