Officer not always permitted to render opinion. State v. McLean 205 NJ 438 (2011)
The opinion offered by the officer does not meet the requirements needed to qualify it as a lay opinion and permitting the officer to testify about his opinion invaded the fact-finding province of the jury. This case involved a drug dealing conviction where a detective, after testifying about transactions seen from an unmarked car while on undercover drug surveillance, opined that they were narcotics sale.