Testimony of ex-clients reported to the NSW Legislative Council alleged that the extremely high overdose rates were due to clients experimenting with poly-drug cocktails and higher doses of heroin in the knowledge that staff were present to ensure their safety. The 2003 evaluation explanation for high overdose rates citing greater amounts of heroin used has been cited by Drug Free Australia as cause for concern. NSW Member of Parliament, Andrew Fraser, made the same allegation regarding the MSIC as a site for experimentation, citing testimony of another ex-client in a Parliamentary speech in 2010.