See Colorado statutes Title 11, article 48, section 106 and Title 11, article 105, section 208.
$50 is the correct figure, and $0 may be the cap if the consumer is not at fault (didn't contribute to the unauthorized transfer by doing something stupid like putting the PIN on the card).
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8