To my knowledge the SUSDP schedules only specific substances as opposed to analogues of those specific substances.
WA has no blanket analogue laws in its Poisons or Misuse of Drugs legislation.
The Poisons act includes the following substances in schedule 9 (prohibited drugs):
ALKOXYAMPHETAMINES AND BROMO-SUBSTITUTED ALKOXYAMPHETAMINES except where separately specified in Schedule 9.
* ALKOXYPHENETHYLAMINES AND ALKYL-SUBSTITUTED ALKOXYPHENETHYLAMINES except where separately specified in Schedule 9.
Therefore, analogues of many of the PIHKAL substances are covered, but certainly not all, including analogues of MDXX compounds not specified elsewhere in the SUSDP or Poisons Act (schedules 8 or 9), unless one stretched the above chemical description very broadly to apply to MDXX substances.
The Misuse of Drugs act talks of the following chemicals:
60. HALLUCINOGENIC SUBSTANCES (structurally derived from methoxyphenethylamine)
131. PSYCHOTOMIMETIC SUBSTANCES (structurally derived from methoxyphenethylamine)
Therefore, in my view, unless the SUSDP does make provision for analogues, then in WA at least, unless your substance is specifically scheduled (in the SUSDP or in the WA legislation), or is structurally derived from alkoxy PEA's or amphetamines (the 2-C series are the classic examples of these) then the substance is not illegal.
The following rather aged NSW Court of Appeal decision is somewhat relevant to the discussion:
http://www.austlii.edu.au//cgi-bin/d...y lethylamine