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having to investigate lots of cases would be counter intuative and would surely lead to a change in threshold level
The trouble with changing the threshold level would be that dopers using 8mg a day orally for the anabolic effects might not get caught. If the urine test for people using permitted doses ranges from <300 to >3000ng/ml (>10:1 ratio), you can probably see why raising it significantly would cause problems when you're trying to catch people doping with only 5 times the permitted daily dose.
We don’t know if there are many other cases like this though, as the process for an AAF is to give the athlete a chance to explain how it happened. There could be dozens of cases like this where the explanation has been accepted and no further action taken. We just don’t know.