Under what conditions do the Zeno and anti Zeno effects occur?

[Trollfaz]

https://www.sciencedaily.com/releases/2000/06/000602074805.htm
The article says that the zeno effect only applies to certain systems while the anti zeno effect applies to all systems. Is this true?

 

[Demystifier]

I don't think that they considered the most general situation. In general, neither Zeno nor anti-Zeno effect needs to occur.