What os a railroad defect detector and how dose it work?
Check your state laws, studded tires may be illegal there. They are here. Due to that I'm not sure which would be best, but I figured I'd give a little heads up.
Recording a conversation of two other people without their knowledge is illegal. Recording your own conversation is, to the best of my belief, legal. If an employer wants to make a recorder contrary to their corporate policy for individuals, that's a different matter. As noted, it was a bit silly to record a conversation, then pull out the recorder. If you're going to be cute, don't be flagrant. Best bet- go see a good tort attorney where you live, since there might be state laws that apply. .. Good luck!!