All banknotes other than the fifty cent note have been undergoing design changes to foil forgery in recent years, although the notes implemented more stringent security long before the US's recent redesign of their notes. All banknotes are the same physical size, like the US dollar but unlike the euro. The latest counterfeit-proof formula is the "Counterfeit Resistant Integrated Security Product", or CRISP. The new $10 banknote was released on 5 August 2005, while the $20 banknote was released on 6 September 2006. In October 2005, someone counterfeited one of the new CRISP $10 bills, serial number A161315. Bahamian authorities warned merchants to look for banknotes that lacked the distinctive watermark.