First, your co-workers have apparently witnessed some of it, as you noted that even they have finally started to notice the harassment. So, you do have witnesses that can corroborate what you have to say. That takes this out of the he said/she said dichotomy. The witnesses do not need to have seen all of it in order to be helpful to you. That they can corroborate some of your story is helpful.
When you get into tape recording situations, the law will vary depending upon whether you are recording in person or over the telephone. For telephone recordings, you will want to refer to this website on covertly recording telephone conversations
. As you can see, Colorado only requires one party to consent to taping a telephone conversation, and that means that you can tape the conversation because you can consent and he does not need to do so. Therefore, if you can get him to talk about it on the telephone, you are on safe ground to tape him.
Taping a conversation at work in person, however, you are on shaky ground in Colorado. You may want to review this site
for more specifics on the problem. But essentially, you could run afoul of the requirement to give notice if taping on business premises without notice.
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