David Marks in his book "The Psychology of the Psychic" (2000) discussed the flaws in the Stargate Project in detail. Marks wrote that there were six negative design features of the experiments. The possibility of cues or sensory leakage was not ruled out, no independent replication, some of the experiments were conducted in secret making peer-review impossible. Marks noted that the judge Edwin May was also the principal investigator for the project and this was problematic making huge conflict of interest with collusion, cuing and fraud being possible. Marks concluded the project was nothing more than a "subjective delusion" and after two decades of research it had failed to provide any scientific evidence for the legitimacy of remote viewing.