I gather that report falsification is a real problem in the industry and from the number of additional "proofs" of visit that have been added as well as "gottchas" in some reports, I suspect the problem is growing rather than slowing. Companies are between a rock and a hard place. They can't generally outright accuse a shopper of lying unless they are ready to prosecute. Their only recourse is to reject a shop they feel is falsified and/or terminate the shopper. That, of course, potentially hurts the innocent as well as the guilty, but chronic liars are generally quite adept at covering their track. At the same time, shopping overall pays so little that few shoppers capable and competent to do other things remain shoppers for long, so companies always have to take risks with new shoppers to fill their rolls. The industry IS based on mutual trust between shopper and company and when that trust is broken on either side it will no longer work.