A police officer with extensive practical experience in drug investigation, including dealings with drug users, may give admissible opinion evidence on the general effects of methylamphetamine, rates of consumption, tolerance levels, and interference with sleep; such evidence is not within the exclusive domain of a toxicologist or pharmacologist. Remedial directions by a trial judge are generally sufficient to cure prejudice arising from hearsay evidence and inadmissible comments in police interviews played to the jury.
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