I think any strategy that 'raises red flags' based on book turnover is going be a very tough one to implement, for some of the following reasons:
1) I like to browse. I check out a book, it stinks, and I return it right away.
2) I'm doing research, and I just need access to a passage in a book. I
read/quote/cite the passage, and return the book right away.
3) I'm fixing my toilet (or pruning my fruit tree, or cooking a recipe, or whatever). I have no intention of reading the whole book. I just get the information I need, and return the book right away.
There are many other cases like this. Its going to be very difficult to separate these cases from those where the reader is up to no good.
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