I'd like you to do a little mental exercise in corroboration, and share your thoughts below.
Remember: corroboration requires that you can use your imagination to think of reasons why something might be the case, and not simply jump to the first conclusion. So here's a thought experiment:
A little country (fictional: I don't want you trying to find answers on Google! This is a thinking exercise) has seen its murder rates get cut in half from 4,200 murders per year to 2,100 murders per year over a ten year period.
The police claim that the murder rate has been cut in half because of their excellent police work.
But what OTHER legitimate reasons might there be to explain the drop in murder rate?
Share your ideas! This fictional country is actually a metaphor for a real-world situation we will reveal at the end.....