Weak respiratory muscles may suddenly fatigue, producing precipitous respiratory collapse. Elective intubation is preferable to emergency intubation or respiratory arrest. The standard 20/30 rule (FVC less than 20 ml/kg or NIF less than 30 cmH20) are the best indicators of the need for ventilator support.
Imminent lawless action is a term used in the United States Supreme Court case Brandenburg v. Ohio (1969) to define the limits of constitutionally protected speech. The decision overturned the decision of the earlier Schenck v. United States (1919), which had established clear and present danger as the constitutional limit for speech.
The U.S. Supreme Court, in United States v. Knights, 534 U.S.112, 122 S. Ct. 587, 151 L. Ed.2d 497 (2002), declined to issue a bright-line rule on this dispute but concluded that when police have reasonable suspicion and the probation agreement authorizes searches, the search is reasonable under the Fourth Amendment.