What is the most important screening when considering a tenant?

[Rene Hosman]

You did the thing, you bought the property, you may have put a little work into it, you got your rental listing up, you had to deal with walk throughs and so many inane questions, you sifted through candidates or finally got an application, now what? What do you weigh heaviest in your decision of whether to let someone lease from you or not? Which of these is the biggest red (or green) flag to you?