How about without credentials?
Also how many species of human beings do doctors deal with?
How many species of trees do arborists deal with?
Yes, without credentials, if folks are so inclined. Besides, having credentials and using them to give customers confidence that you know what you're doing is a whole different thing than the government telling the customers they can't hire you without them. I have no problem with the ISA offering certifications and using that as a marketing tool. I have no problem with organizations requiring contractors who submit bids to be certified. What I do have a problem with is the government, at any level, deciding who is and who is not qualified to work on trees. That decision should be the landowner's. And yes, doctors do work on one species (unless they're a veterinary doctor), but I still think their work takes more education and knowledge than ours. If I screw up a prune job, the worst that can happen, usually, is the tree dies and has to be removed. If a doctor screws up a heart surgery, the patient could die. I believe his patient's life is a hell of a lot more important than my patient's.
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