We use Creo equipment for our prepress equipment and they have developed a very interesting product to prevent fraud.  List below is some information from their site.  If you are interested you can get more information by clicking on the link to the left.  If you would like talk to someone about this please click the contact button above.

Creo is in market development phase for its newest technology. Traceless™ allows you to create unique, optically and forensically-invisible identification codes. Only Creo readers can detect the presence of the security taggants.

To guarantee authenticity and catch counterfeits, Creo taggants can be added to:

With applications in printed security documents, labels, packaging, containers, and high-value parts and equipment, Creo Traceless solutions can be used for anti-counterfeiting, inventory management, product tracking and tracing, or simple brand authentication.

The need for Traceless technology
An overwhelming number of high-value items, including passports, checks, currency, bank documents, tobacco and alcohol products, high-profile consumer and retail brands, garments, and shipping packages are at risk of counterfeiting and tampering. New innovations in desktop computing make producing convincing fakes cheaper and easier than ever before. Identity and brand theft costs companies billions of dollars annually, and is increasing each year.