That school needs a policy change. NO ONE ALLOWED TO WALK HOME! It's just too far away!!!
I don't think that is going to happen. I'm in the southern part of the state and I think my experience with school practices is typical.
Elementary schools monitor students very closely while they are in the school's custody, i.e. on school grounds during the school day. The main door has a buzz-in system for visitors. The other doors have either a badge swipper (not sure what you call those things) or keypad for staff members to access. Children on special errands like bringing attendance reports to the office are always in pairs.
If a parent wants to dismiss a child during the school day, the parent or adult they have designated in writing must be buzzed into the school, check in at the office, show identification if the staff doesn't recognize them, and sign the child out.
Students in grade school are led to their buses in bus lines or are brought to the designated parent pickup area. Parents fill out a dismissal plan at the beginning of the year. Any deviations, like I am picking up Susie at dismissal instead of having her take the bus, require notice to the office in advance.
Students must bring in notes in writing from both sets of parents if one student is going to another's after school. The staff escorts or monitors walkers or bike riders to the edge of school property.
Middle school has much less rigid policies. In middle school, visitors must still be buzzed in and students must be dismissed by an adult going in to the office and signing them out. But IDs of the adults are rarely checked unless the staff has reason to suspect something is "off."
Middle school students can enter and exit various doors during the start and end of the school day. Parents complete a dismissal form at the beginning of the year but it is just for informational purposes. Deviations don't require any notice. Any kid who wants to take a different bus to a friends's after school needs to bring a note in from his or her parent in order to obtain a bus pass. That's probably because of the bus company regulations. The friend's parent does not need to write a note.
School administrators and staff are outside when students are arriving and at dismissal to monitor behavior and facilitate traffic flow. No one checks who is going where.
Our high school is even looser. My kids go to a large, regional high school. Regional schools are fairly common in NH. But ours is unusual because there are many buildings spread over a huge campus. There isn't even one administrative/attendance office, there are at least two per grade and they are in different buildings around campus. Visitors are supposed to "check in" but it is not apparent where you are supposed to check in.
The size and layout of our high school is unusual but I think the policies are similar in other NH high schools. The high school does not monitor where students are going after school. They may have a policy of needing passes to take a different bus, but here at least bus drivers don't check for them.
With all the different places high school students could be going after school, it would be a logisitical nightmare for schools to check. They are responsible for students while they are on campus and during the school day or school-sponsored activities.
I know this is a very long post, but I thought it may help. While I certainly understand your sentiment, and perhaps it works that way elsewhere, I don't think it'll happen here. We're Yankees and we don't want everyone knowing our business. And this is the Life Free or Die state, which means NH is known for not wanting government oversight. Schools here are run separately from town government. SAUs (School Administrative Units) are a separate entity. In other states I've lived in, school districts are part of the town government.