User blog comment:Cackling Shadow/Blue Beetle Betrayal/@comment-81.97.210.110-20130120190821/@comment-5656020-20130120194527

I doubt it would be a controller, that just seems too easy. I think it would be more likely that the additive contains some sort of tracer that would be activated in the presence of an active metagene. That would allow the Reach to hunt down and capture/pick off any metahuman that accidentally ingested the tracer.

If there were such a controller, the Post-Apocalypse Reach would be able to inject an even more powerful dose into all the humans, and Impulse and Neutron wouldn't have had a chance of building time machine because as metas they'd have been given extra intense doses of the controller to keep them from causing trouble.