Can I become a cop if I am a YO (youthful offender)??

They can do that

https://www.google.com/search?q=Parole+cdcr+no+communication

Your original conditions can be very easily be modified.

Sentencing, Incarceration & Parole of Offenders

CDCR (.gov) https://www.cdcr.ca.gov > victim-services > sentencing
CDCR requires all parolees to follow conditions of parole, which may include such special conditions as no contact with the victim or victim's family or that ...

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No..against ACLU

Mobile Notary Business
There are certain steps you do need to take so that you will have a successful notary business.

• Become A Notary. Each state has its own requirements to become a notary. ...
• Purchase The Right Supplies. ...
• Advertise Your Notary Business. ...
• Keep Proper Records. ...
• Expand Your Notary Business.

How To Start Notary Business Notary net https://www.nationalnotary.org/notary-bulletin/blog/2018/03/mobile-notaries-on-the-rise

https://www.nationalnotary.org/notary-bulletin/blog/2015/01/creating-successful-mobile-notary-business

https://nationalparalegalnotary.com/technology-is-the-key-to-growing-your-mobile-notary

How To Start Notary Business Notary net

If the train didn't hit you, you and the engineer are about the only ones who will know, unless a cop saw you, in which case you would already have the ticket.
As of yet I haven't seen any traffic cameras that auto-mail you the fine for railway crossing infractions.

Depends on the country you are in, There is a statute of limitations on some things.