( 4 ) No one who seeks emergency medical or law enforcement assistance because that person, or another person, is suffering from an overdose, or who is at the scene upon the arrival of the assistance, is to be charged with an offence concerning a violation of a pre-trial release, probation order, conditional sentence or parole relating to an offence under subsection 4 ( 1 ) if the evidence in support of that offence was obtained or discovered as a result of that person having sought assistance or having remained at the scene.