I found two problems with the base set of rules for this game. First, the auditor should almost always challenge the case, because there is an incentive to play false evidence (one credit) and no penalty to the auditor for challenging a case that doesn't use false evidence.
Second, the rules allow you to hide the evidence you use by shuffling your evidence into the discard pile, but the discard pile is never large enough to make this rule matter.
So here are my recommend changes:
1. If the auditor challenges a case that has no false evidence assigned, they must take a hardship card. The auditor is still paid one credit.
2. All evidence cards should be discarded face down. A player may only look at a discard pile if they have the ability to draw from that discard pile.
3. At the start of the game, discard the top 5-10 evidence cards from each pile. These represent the evidence already stored in the arcology.
4. (Advanced) Sifting through the arcology datastore is time-consuming, and jovans hate wasting time. Thus, any player that uses their strength to look through the discard pile must draw an evidence card from the arcology.