The process has two stages. In the large contracts, you have to have a pre-award audit completed in order to be awarded the contract, and on the large contracts, there's always a post-award audit. If you follow the procedures for the post-award audit, you will uncover when the criterion of indigenous content was not being met.
As you can see, if you don't perform the audit, you won't know whether or not they adhered to the criterion of indigenous content. There are no real gaps. The audits were in place to ensure that the program was being used properly.