There's a bit more to it than that, at least in regards to pill testing in Qld, which hasn't happened since the late 90s afaik. Taita can probably elaborate here if he's around. Enlighten tested for many years at events in Vic and Adelaide, but when the subject became in the spotlight (check past BL posts) it was quickly evident it wouldn't be supported by authorities.
Since the time I've been involved with RS (early '99), reagent testing has never been done by our group. While I campaigned long and hard to get approval, or at least some dialogue with authorities, in the end it was decided a better approach was to bypass the problems associated with reagent testing and strive directly for an authority sanctioned form of lab testing.
The reasons for abandoning the idea of onsite testing were numerous. Just briefly, the major problems involve the inaccuracy of the tests (incl. liability issues), the handling of controlled substances by those not authorized, and the numerous objections from politicians, health officials and community groups regarding "sending the wrong message".
However, times have changed, as have the types and numbers of new drugs regularly entering the market. In relation to this, the importance of an early warning system is now well recognised by everyone from LE, to Medics, to HR groups. We all seem to now be on the same page. Accordingly, considerable ground has recently been made towards getting approved lab testing up and running (& making results available to the public). I'm more optimistic than I've ever been that a pilot project (or 2) of some sort will occur in the near future.