Hint number one:
If you are looking at a piggy bank or card type donation device in a public place, and you do not know the organization very well, don't give. Most of these collection items are by companies who pay the organization a flat dollar amount for the right to use their name for a set period of time.
Joe's Fundraising will give the American Diabetes Association $10,000 in four quarterly installments, and in turn the ADA allows Joe's to put collection jars in businesses in these states.
Regardless of what Joe collects, the ADA only gets $10,000, but since Joe collected in ADA's name it all shows up as income and expenditure in fundraising.