In the television series Fringe, why is it that the security checks -- both in roads and in high security areas such as headquarters -- are more severe, with all the Unique Ids and hand scanning, than in the original timeline / universe in which the series started?
They were more severe because after the kidnapping of Walternate's son, two paths emerged. Walter on "our" side eventually ended up in an asylum and no one believed him about anything. The Walternate Walter, instead, rose to power and knowing of the threat and being in a position of power within the government was able to drive huge levels of increased security based upon that threat from our universe. It was Walternate's plan all along to rise to power based upon perceived threats and use that gained power to eventually launch attacks against our universe.