When a law is passed that says "Do what the executive agency says.", then it makes executive orders that control that executive agency on the level of laws. Even with some limits in the original law, the executive order becomes like a law at least within those limits. But it isn't a law, meaning that some protections based on laws aren't offered. So now we run into an issue where we have things that aren't laws that effectively work as a law as far as the common man cares. The only simple fix I see for this is to require that all laws must clearly define what is and isn't illegal without any regard to another system's interpretation of the matter (but as with any simple fix, it is never that simple).