I am 100% sure of these thing, just consider some of the things that they sabotage as part of the equation:
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Attacking your sprinklers, water, spigots, hoses so you can't wash off them chemicals.
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They broke into my home and put sand and pebbles into my washer hose line when I wasn't home, so you cannot wash off the chemicals thoroughly.
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Many inconspicuous holes in the home so that they can spray chemicals, and some obvious ones where they have no choice.
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Gaps in certain areas of fencing and underneath in optimal spots to spray or view.
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The angle and placement that they build sheds, extra windows, and other backyard implements.
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How they cut or plant their foliage to their advantage.
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When they all seem to do their yardwork on some days and other days that they do not venture out.
The real problem is that because no one who has been targeted notices these things, they just get sick and eventually die, there is not a consensus yet as to these undermining's.