I have been a bus driver since late 2006. I know the inside story, the scoop, the down low dirt of what it takes to be a bus driver, how to handle kids and adults, and how to survive on the "streets" so to speak. I used to have a blog, feel free to browse it or ask me a question here.
See my previous answer.
Generally if someone chooses to watch explicit material they are discreet about it and use headphones. I can usually tell if something isn't right by the looks on kids faces and whether or not they draw a crowd. With the added availability of technology everywhere, explicit material is widely available to even the youngest person. If someone were to be reported for watching porn, I would have to write them up and confiscate the device.
No not legally required. There are special circumstances where it might happen (like a terrorist attack which may close down major cities etc) but most states leave the decision up to the individual districts and schools to make that call.
Help Desk Technician
Security / Bodyguard
 Have you ever had to disarm an attacker?
Have you ever had to disarm an attacker? 
                                        
                                        
                                             Dry Cleaner
 What happens to clothing at dry cleaners that goes unclaimed?
What happens to clothing at dry cleaners that goes unclaimed? 
                                        
                              Find another job.
That depends on the district. Most districts prefer drivers to try to get along and strike a balance with their bus kids.
Most school buses are now automatic shifting so jake brakes are not necessary or needed.
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