Your wrong, the DRUM has nothing on it, the developer on old copiers does, back in the days when copiers required liquid developer, also plate makers for presses obviously. The laser in a laser printer used to be and sometimes still is a gallium arsenide laser, which is a bonded chemical and has no bearing in leaching or in processing. Copiers with liquid developer were last made in the 80s so far as I've seen in my adventures. Nearly all laser printers I've gotten in scrap use either an c02 laser or a led laser, depending on the brand and speed of the printer.
((pulled this from an article on drum composition))
The OPC or Organic Photo Conductor Drum is the heart and soul of a laser printer. This is one component that makes laser printing really possible. The process of electro-photographic (EP) printing requires the OPC Drum to play host to the negatively charged raster graphic image routed by the laser scanning assembly. How the OPC Drum accepts and retains the electro-static charge can be determined by inspecting the materials and substances applied to the Drum’s surface.
The term Organic simply indicates that the OPC Drum is coated with biodegradable materials that will not in any way cause harm to the environment. The drum’s coating is made up of petroleum substances such as carbon based chemicals. These are photoconductive polymers extracted from by products of fossil fuel refining activities. Manufactured from organic compounds, OPC Drum coatings are classified as non- hazardous and can therefore be used extensively in various printing applications, particularly that of the laser printing equipment. Earlier released photoreceptors such as the Arsenic Triselinide (As2Se3) and Selenium Tellurium (SeTe) Drums were considered hazardous.
To be even more specific, unless your scrapping 30 year old industrial xerox machines there is NO FRICKIN WAY you have arsenic in a business or consumer level laser printer. And as for inkjets, it's soy, you can drink it if that was your fancy. Every day I have to explain to people what happens to their devices once they are given to me. To be fair when it's a device I know was made before 2006, boards come out for sure. If it was made before 1988-89 chances are I also pull the cartridges and the toner AND the drum. After that there isn't anything hazardous in there anyways. If by chance your yard did accept a copier or two with liquid developer, which contains arsenic...then stop the presses, that answers the question.
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