Pollination occurs when a synthetic identity that has built up a positive credit history adds other synthetic identities as authorized users to its financial accounts. This technique can be challenging to detect, as it involves the use of multiple synthetic identities and authorized users across a few financial institutions. The fraudster may create multiple synthetic identities and use them as authorized users on the same account, allowing all of the identities to build up a positive credit history. Alternatively, the fraudster may use the same synthetic identity as an authorized user on multiple accounts, allowing the identity to build up a positive credit history across many financial institutions.