Two hustlers are working a scam together. Five suspects Andy, Brad, Cal, Dave and Ethan have been identified. Each of the suspects makes a statement. The two guilty ones make false statements. The other three make true statements.
The statements are as follows:
Andy: Ethan is not one of the guilty ones.
Brad: Cal is not guilty.
Cal: Dave is innocent.
Dave: If Brad is not guilty, then Andy is guilty.
Ethan: Cal is guilty.
Which two out of the five suspects are the hustlers?