They have taken to warding cemetaries and other places with corpses to prevent shedim infestation. But I wonder what might have slipped through the cracks. Mass graves in death camps? Tanamous' chop shops? (I've ben thinking lately about adventures I could run for my SR game that could secretly turn out to be shedim plots. Shh! Don't tell my players.
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Does anybody remember something from older editions about people storing their dead in these huge arcologies because there was so little land left to spare for cemetaries? I think it was called a necropolis or necroplex or something? I remember an old SR1 or SR2 adventure I ran in SR3 where ghouls were stealing the bodies, and they stole the body of the brother of a shadowrunner called Alpha Blue and found some incriminating data on a corp in his headware (which was what he got killed for), so Alpha Blue hires the runners to track it down. It was particularly memorable because the runners met a street shaman in she sewers who'd tried to look beyond the edge of the manasphere... and whatever he saw was so horrible, he tore his own eyes out.
I wonder how many mages it took to ward a huge necro-complex like the one in that adventure. And I wonder if a master shedim pretending to be a Johnson might not hire some runners to take down those wards, then open up an astral gate so that an army of shedim can possess the bodies there and unleash an army upon the streets of Seattle....