When the public started using ChatGPT, companies issued all-workforce warnings to halt or strictly limit employees’ use of it and other breakthrough generative artificial intelligence (Gen AI) tools. Many companies then handed out memos with dos and don’ts for using Gen AI on the job. Many software suppliers have since released Gen AI tools tailored to business use. With these enhancements, companies run the programs behind their systems’ firewalls – which allows security checks – and train Gen AI using only in‑house data, reducing the risks of proprietary data leaking into public searches. A lot of companies have now updated their rules to steer employees away from public third-party Gen AI tools, even for brainstorming. This article examines employers’ shift in Gen AI policies and practices, including training and risk assessment, and presents several dos and don’ts for employees’ Gen AI use. See “How to Apply Alt Data Best Practices to AI Systems” (Oct. 10, 2024).