The list: transformation guarantees ("become unstoppable in a weekend"), secret-technique mystique (real skills demonstrate openly), certificate emphasis over practice hours, lineage worship with no observable teaching ability, hard-sell payment pressure at free events, "scientifically proven" claims, and any hint of clinical treatment for clinical conditions.
The positive test: can you watch the trainer demonstrate, ask hard questions without offence taken, and see observed practice hours in the schedule? Everything on our side of that test is in the how-to-choose guide.