We don't allow tag wikis/excerpts to be copied directly from anywhere, including wikipedia. Unfortunately (IMO), not everyone checks for plagiarized content in every wiki edit, and sometimes bad content gets through.
For example, this wiki edit made it through this morning, and is lifted directly from Wikipedia without attribution.
There is no ability to flag the entry or otherwise bring them to a mod's attention. When we find instances of plagiarized content getting approved, what is the proper course of action?