I get a Staple Detect error each time I try to scan a page. I've checked all of the rollers; they are fine. There are no staples anywhere in the picture. Can I turn Staple Detection off?

I presume you are using CpaturePerfect3 Scanning software. There is an option to stop checking of 'staples'.
In Canon 9080C staples are NOT detected by any metal detector! You'd notice a set of LEDs on one side and a set of sensors on the opposite side of the scanner wall, just above the paper tray. Incase there is a document thats stapled, while one sheet is going in, the other sheet will get lifted because of staple. Thus when there is obstruction in the LED sensor, it is presumed to be a stapled document. Conversely, even if a document is bent enough to block the sensors, the scanner assumes it as a stapled document. Ensure your documents are fairly flat.
S. Mohan, Chennai, India