Ruckus Wireless (RKUS)

[danparker111]

So as the end of the trading came, I was looking at RKUS and it was trading between 20.00 and 21.00 all day, mostly well under 21. And then, just as the day closed, Scottrade listed it as well above 21 (should have taken a screenshot), and is now back at 20.58. I looked at the graphed summary for the day in my Scottrade account, and it does not show the blip at all, perhaps because the less-than-one-minute lasting spike occured just after the market closed (after market trading)? I'm wondering how this happens, and if there is a way to guess if a stock is going to be 'traded' this way after hours (as a way to avoid it.)