As long as you are within your rights and following the laws why worry about it?
It helps when government agents come to your lab to have it in order.
It helps to have a better understanding of the chemistry involved than the federal agents that wake you from sleep, a better understanding of the dangers to yourself and others and the environment than the DEQ agents who come to investigate, a better understanding of the law than the armed officers and agents.
Be working within your legal rights, with chemistry and chemicals in a legal and environmentally safe manner.
Have MSDS on file and have chemicals stored properly, or in safe conditions when the lab is inspected.
It is helpful not to have fumes of chemicals or metals in your home, soils around the lab when tested, or where they should not be, the DEQ agents used machines which sniffed for traces of mercury and other chemicals and fumes when they searched my lab, storage sheds, barn, well house, chicken coop, and my home.
It is helpful if they cannot hang anything on you-- if they can be sure they can and will try to hang you.
Educate yourself, work within the law, and work safely.
Do not trust others to know the laws or to let them tell you what is legal, educate yourself, your friend can be wrong.
Do not think you know, educate yourself to find out how much you did not know of what you thought you knew.
PS it is helpful to be respectful and helpful to the officers inspecting you or watching you.
The local News is not very helpful when they report that you have guns and you do not like cops, the officers seem to show up heavily armed as they pile out of the black SUV's before the sun comes up to raid your home.
PS do not ship any mercury or do anything with the chemicals deemed illegal, I found out the hard way it was illegal to ship mercury.
If only I had educated myself I would have saved myself from being sued for a hundred thousand dollars by UPS lawyers, and the risk of spending my golden years in prison, Thank goodness the officials chose not to prosecute and I still maintain my freedom.