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A few angel investors have slipped or fallen from their lofty perch, so entrepreneurs must take great care to validate the character and reputation of every prospective investor. The entrepreneur’s tendency to be in a huge hurry to obtain the funding can end up being disastrous, and play into the hands of these less scrupulous investors.

Many entrepreneurs believe all money is created equal. As long as somebody recognizes their million dollar idea and writes them a check, the source really doesn't matter. In fact, most angels are pure, but there are some exceptions that may cost you more than an investment:

Original Article: Avoid these eight types of angel investors | Technology Transfer Tactics