Aren't many/most IEDs utilizing cell phones? Where's the rationale in banning a laptop if you can make one out of something even smaller and more ubiquitous? He

Aren't many/most IEDs utilizing cell phones? Where's the rationale in banning a laptop if you can make one out of something even smaller and more ubiquitous? Hell, I bet you could stuff plenty of explosive material into one of the more expensive Otterbox cases.