PEOPLE VS. DENNIS LEGASPI G.R. NO. 117802 (2000)
Facts: A was illegally arrested. During arraignment, he entered a plea of not guilty.
Issue: Whether A validly waived their right to raise the
infirmity of their arrest.
Held: Yes. Upon entering a plea of not guilty, A validly waived his right to raise this infirmity and assail the legality of the arrest. Any
objection involving a warrant of arrest or the procedure in the acquisition by the court of the jurisdiction over the person of an accused must be made before he enters his plea, otherwise the objection is deemed waived.