If the law enforcement is trying to find a murderer, or they're trying to catch a drug lord or trying to prevent a school shooting, and they have leads and they have suspects, then it's perfectly fine for them to tap the suspect's phone, and to intercept his Internet communications.
Si la policía intenta encontrar a un asesino, o trata de atrapar a un capo de la droga, o intenta evitar un tiroteo en una escuela, y tienen pistas y sospechosos, entonces está perfectamente bien que interfieran el teléfono del sospechoso, e intercepten sus comunicaciones por Internet.