How to spot a bogus charity collector

Giving to charity shows the best side of people - their selfless choice to give generously without expecting anything in return. So it's particularly appalling to hear of cases where that generosity has been abused by people using this selfless act as an opportunity to rip people off.

One recent terrorism case revealed that the plotters had funded their crimes by doing just that. So how can you spot a bogus charity collector?
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