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It's very simple: You set up a perimeter around the start and the finish lines (which is where people congregate) and search the bags of people who enter the perimeter
It's what they do at other sporting events and concerts, etc.
The NYPD and TSA do bag inspections at certain train stations. Since it isn't all train stations even an idiot terrorist, and most of them aren't rocket scientists, can figure out that just walking a couple blocks will get them to a station that doesn't have a police presence. In short bag inspections are next to useless.