Dispute notation on credit report

Where does it say that a collection agency must report an account as "in dispute" after they have received a validation request from the consumer? I can't find it in the FDCPA.

 

but that does not apply to collection agencies, does it?

 

OK...nevermind. I was confused. All this time I thought the FCRA only applied to the CRAs. I didn't know it had information in it that applied to the collection agencies.

So the section I was looking for is 623 of the FCRA.