Critics brand control orders as «house arrest», an affront to civil liberties, and of questionable effectiveness as seven people under them have escaped. (theguardian.com)
DO N'T Buy into over-the-counter bleaching products, which can be too abrasive on teeth and too harsh on gums, with questionable effectiveness. (womenshealthandfitness.com.au)
Yet, much so - called premarital counseling is of questionable effectiveness. (religion-online.org)