Your last few words sums up your limited vocabulary and explains why you have completely missed my point.....which was (in simple words) it is difficult to detect small devices in a security search in the limited time available.
I didn’t mention people getting injured.
defend the indefensible? I await the facts (and you've side stepped my question about how the stewards would frogmarch the ultras and conduct full body searches)
you make it sound like hand grenades were going off every 5 minutes.... they were smoke bombs or flares small enough to conceal down a sock, in pants, etc. Whilst searches act as a deterrent and would expect to find knives, etc they cannot be expected to be 100% perfect. And how would the...
much easier to collect the evidence (on cctv) during the match and them nick them after, rather than trying to drag them out during the match. Seems like the police were busy outside during the match.