Elected representatives do not write laws. Their legislative aides write the laws. While some state governments have highly professionalized legislative aides, in the federal government, such positions are typically poorly paid stepping stone jobs filled by people in their late 20s/early 30s who have little domain expertise.
Not true.
The majority of the bills are written by lobbyists. Most of the bills introduced are so called "copycat" bills.
USA TODAY and the Republic found at least 10,000 bills almost entirely copied from model legislation were introduced nationwide in the past eight years, and more than 2,100 of those bills were signed into law.
Special interests sometimes work to create the illusion of expert endorsements, public consensus or grassroots support. One man testified as an expert in 13 states to support a bill that makes it more difficult to sue for asbestos exposure. In several states, lawmakers weren’t told that he was a member of the organization that wrote the model legislation on behalf of the asbestos industry, the American Legislative Exchange Council.
https://publicintegrity.org/politics/state-politics/copy-pas...