Be Careful about Donations

A federal judge has ruled that the U.S. government acted legally when it denied an entry visa to the prominent European Muslim scholar, Tariq Ramadan because he had donated money to an organization that passed some of its funds to Hamas.

Does this mean that every dollar/pound/yen must be accounted for?  Consider the ramifications of trying to keep track of every scarp of a donation someone makes!  Do we know what the United Way, Salvation Army, etc, etc... do with every bit of every single donation? 

Pretty high standard when you think about it.