Which of the following are special cases where warrants are not required before search or arrest? (select all that apply)

At international borders and ports of entry such as airports

At fixed point searches such as a sobriety checkpoint

When an individual has previously been convicted of a criminal offense

When evidence in in plain view of officers investigating a criminal complaint

When multiple witnesses identify the same suspect

In emergency circumstances where the evidence is likely to disappear

During a routine traffic stop where there are no other suspicious activities

With searches in schools

The contents of an detained individual's pockets

When police are on the scene of a violent crime in progress