I tested checks completely processed ourselves using VersaCheck software with the no signature required method and had about a 10% bounce rate. We verified checks manually before e-mailing the password since most banks offer phone numbers for merchants to call and quickly enter the account number to verify funds.
Then for the bouncers we had a very effective form letter we e-mailed highlighting their "pornography" purchase and giving them a short period of time to rectify the situation prior to us entering their data into all the databases on this wonderful little web site.
http://www.ckfraud.org/
We got amazingly quick make goods after they would see what that site does. Hahahahahahahahah.