Yes, they're prepared with cut-off limits. The one used in Australia is the same as those used elsewhere. It had a cut-off limit for THC, for example, of 10 nanograms per millilitre.
Last year, in November, this kit was available with five nanograms per millilitre. It had a lower threshold. It's now what is being used in Australia as well. A positive test means more than five nanograms per millilitre of THC in the saliva.