It doesn’t matter how much time you have spent in a chemistry lab, when you are the one who is responsible for the lab and the students who use it, you have much to consider. As a refresher I took a Laboratory Safety Class from Flinn Scientific earning a Certificate of Completion (see below) for my efforts.
I was very impressed. The presentations were very professional and incredibly thorough, and many of the narrative-styled presentations were even enjoyable. I would recommend this course to all high-school teachers who spend time in the laboratory, and a middle-school version is also available. Flinn Scientific did get a bigger share of my laboratory budget as a result of providing this free service, but most of the changes I made did not directly benefit Flinn at all. See my posts on Custom Chemical Storage Shelving and on an Emergency Chemical Spill Center.