Colorado Code
Part 5 - Collection of Documentary Drafts
§ 4-4-501. Handling of Documentary Drafts - Duty to Send for Presentment and to Notify Customer of Dishonor

A bank that takes a documentary draft for collection shall present or send the draft and accompanying documents for presentment and, upon learning that the draft has not been paid or accepted in due course, shall seasonably notify its customer of the fact even though it may have discounted or bought the draft or extended credit available for withdrawal as of right.
Source: L. 94: Entire article amended with relocations, p. 903, § 2, effective January 1, 1995.
This section states the duty of a bank handling a documentary draft for a customer. "Documentary draft" is defined in Section 4-104. The duty stated exists even if the bank has bought the draft. This is because to the customer the draft normally represents an underlying commercial transaction, and if that is not going through as planned the customer should know it promptly.