Without a doubt, determined illegals could still get into this country. But with a big enough fence, it would be a lot harder.
I have said this before in another couple of threads, and the fence crowd ignored it.
So, you want a fence, eh? We have one here. It is called 18 to 100 miles of sea water between the UK and Europe. A slightly more effective barrier than a poxy 30 foot fence, right? We still get between 600k and 1 million illegals coming in per year.
Italy has 50 to 200 miles of sea as their fence - they get the same sort of infulx - every year.
Dont talk crap about fences. Boots on the ground!