People who've been subject to security agencies' scrutiny are questioning whether the far-reaching powers are being misdirected or misused.
Both Muslims and non-Muslims have spoken to RNZ about how the open-ended surveillance has left them nervous about travelling overseas, engaging in political activities or being outspoken.
But Dr John Battersby of Massey's Centre for Defence and Security Studies says from what he knows, the likes of the NZSIS and police are using their limited resources appropriately.
He speaks to Phil Pennington for RNZ Insight. Tune in to 101FM at 8am Sunday for the full Insight report.