Perth has a inbound crew passport line ...on the RHS...which then comes back to center.
There is also a dedicated quarantine/customs lane on the RHS of the raceway - you wouldnt know it - but there are little white signs on the top of the raceway (Crew or assisted pax). An officer stands there to let you through to the xray....or directs you to quarantine - the raceway usually puts you in front of the pax.