Whether or not that is the case, it seems to me the most interesting conclusion of the study was this:

> the bacterial responses were correlated to the results of previous toxicity studies and bacteria may be used as a toxicity evaluation tool.

One would want to establish that this method is actually useful, no? It seem this study is pointing in that direction.

If it is effective, there may be interesting ways you can use this test, such as:

> The tested bioluminescent bacterial panel can potentially be used for detecting artificial sweeteners in the environment.