Suppression of evidence occurs when a judge prevents illegally obtained evidence from being shown in a trial OR a lawyer intentionally hides evidence that does not support their case in order to prove that the defendant is guilty, even if they’re not. The first incident, regarding the judge, is completely legal. Meanwhile, the latter incident involving the lawyer is illegal. In fact, a lawyer who intentionally hides evidence to best support their case is violating the 5th Amendment to the U.S. Constitution.