NEW ORLEANS — In late 2018, Eyewitness Investigator David Hammer began checking into complaints about school bus operations, the conditions of buses and the status of the drivers. What he found led the New Orleans City Council to seize control of school bus inspections and licensing. And his stories raised more questions about other problems, such as allegations of a rigged contract, falsified insurance documents, changing of public records and grade-fixing, leading state and local authorities to investigate.

Here's the latest update from the Eyewitness Investigation:

Nearly 100 N.O. school buses have failed inspection; hundreds more haven't been looked at

And you can read how the Taken for a Ride investigation developed below:

- Taken for a Ride: How safe are charter school buses?

- Taken For a Ride: Charter school bus firms cutting corners to save money

- Taken For A Ride: Charter School Bus Safety Search

- Video shows tire off school bus, students jumping out onto highway bridge

- Taken for a Ride: Subcontractors driving buses without some charter schools' knowledge

- City Council passes new school bus regulations, hoping to stop unsafe, illegal practices

- WWL-TV Exclusive: School bus company's insurance certificates 'falsified,' agency says

- Investigation launched based on WWL-TV report showing buses being driven with 'falsified' insurance

- Emergency order issued against local school bus company after WWL reports

- Schools using Scholars First say buses now have valid insurance

- WWL-TV Exclusive: Records, sources say charter school falsified board minutes on bus contract

- Former Kennedy HS administrator fired after reporting alleged 'grade fixing'

- Orleans school board re-opens grade-fixing investigation

- Charter school board hires investigator to look at allegations reported by WWL-TV, places CEO on paid leave

More allegations emerge against suspended charter schools CEO

- Einstein Charter fires school bus contractor after WWL-TV investigation

- Charter school board votes to fire school bus company exposed by WWL-TV

- New Beginnings board likely to take action soon on suspended CEO

- Charter school CEO resigns amid investigation into WWL-TV report

- Charter board takes action, but gives few details on malfeasance at Kennedy High

- Kennedy High principal, leadership out over grade-fixing scandal

- Charter school system under investigation names new CEO

- Kennedy High seniors still waiting for diplomas as grade-fixing review continues

- Nearly half of 2019 Kennedy High graduates have to take more classes

- New Beginnings Schools Foundation surrenders charters after WWL-TV investigation into grade fixing

- Kennedy High students, denied diplomas and transcripts by adults' actions, must wait yet again

- Law enforcement agencies eyeing Kennedy High misconduct

- Kennedy High students could lose scholarships, opportunities due to school's mismanagement

- Kennedy High students, denied diplomas and transcripts by adults' actions, must wait yet again

- 'New Beginning' at Kennedy High School? Students return after grade-fixing scandal

- Nearly 40% of charter school buses not up to new standards set after Eyewitness Investigation

- 'You just continue crushing dreams': Kennedy High graduation scandal gets worse

- No diplomas for more than half of Kennedy High 'grads' forced to retake classes this summer

- Misconduct by Kennedy High officials costs student her college scholarship

- 8 more Kennedy High students receive waivers for diplomas after grading scandal

- More students, parents join lawsuit on Kennedy High problems

- New Orleans grants second grace period for school bus inspections

- Kennedy grad finally gets transcript, can keep football scholarship

- School bus driver sends kids off bus after accident, drives away

Nearly 100 N.O. school buses have failed inspection; hundreds more haven't been looked at