It seems that it is common practice in the US to confirm ventilation prior to paralysis. This theoretical point of practice is not utilized worldwide (Australia, the UK, New Zealand to name a few). I was taught like many others that if you couldn't ventilate a patient then by omission of paralysis you could simply wake the patient back-up. Check out the link below to a review in the British Journal of Anesthesia.
In a survey of 50,000 airways, 77 were found to be difficult to ventilate. In 73 of these cases, the patients were given sux and subsequently ventilated. So what's the point in confirming ventilation if the response is to push paralytic anyway?