[lepton]

In this case, those other 19 groups ought to respond publicly fairly quickly--"we tried that too, and it didn't work for us."

[beagle3]

No they usually don't. Because the "didn't work for us" is usually not conclusive proof of the contrary.

It does (rarely) happen in Physics where everything is expected to be repeatable, and results from one experiment carry over to similar experiments. It almost never happens in medicine, where the bar of acceptance of a hypothesis is already ridiculously low.