Part of The Flash is that they tend to
kidnap and deny constitutional rights to capture evil Metahumans and keep them in the particle accelerator. That works because of some pseudo science about how the particle accelerator works.
In Season 2, it turns out that Iron Heights, the prison in/near Central City, can now safely harbor metahumans (within the confines of the criminal justice system). How exactly did they do that? Did Star Labs share the exact specs for the particle accelerator? Did they construct the same type of cells?
What is the (in-universe) science behind it?