This is a slippery question. Certainly, if you suspect your spouse is cheating, lying about something significant, or involved in criminal activity, it would be helpful to have a witness who could provide proof. However, it certainly is a sneaky way to proceed with a divorce, and my taint you in the eyes of the judge. And remember, it is always possible your ex could find out they were being followed, and this will cause you nothing but trouble.
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it can be helpful or harmful
sometimes they are helpful and harmful.
Bacteria can be both harmful and helpful
Sandpaper is both helpful and harmful.
they are helpful not harmful to plants
harmful
Depends on what part of "harmful" or "helpful" you are referring to.
helpful
Helpful
helpful
Harmful bacteria will harm you. Helpful bacteria will help you.