The "criminal justice field" is pretty broad so really it just depends on what you're looking for. In general terms, yes. Though a felon will never be able to be a police officer, district attorney (in most states because they are peace officers), Coroner's investigator (same reason), etc. because they have the ability to carry a firearm which is prohibited by federal law. Fields which wouldn't require carrying a firearm a felon abosulety COULD. Though actually getting a job would be difficult....
Misdemenor, maybe. Felony NO!
Can a convicted felone become a juvenile probation officer.
Yes, there are alot of websites that will help by giving you information on becoming a correctional officer. Try http://www.allcriminaljusticeschools.com/legal-careers/corrections/corrections-officer-career and http://education-portal.com/how_to_become_a_correctional_officer.html.
There are programs in law enforcement that focus on becoming a Correctional Officer. What is required for the position depends on the hiring agent. Some positions may require a degree in the field or a related field, while others may require no special background. Some Corrections Officers are former police officers; others have a background in social work or psychology. Read more about the career here: http://www.allcriminaljusticeschools.com/legal-careers/corrections/corrections-officer-career
It take a long time. You have to either get a BA in something pertaining to that field or preferably a MA.
No.
Most big correction institutes have their own on-site training for new recruits. You should inquire there about requirements.
Generally, no. Animal control officers need to use firearms at times. Under Federal law, a convicted felon may not possess any firearm.
Yes, it is possible to become a police officer with a misdemeanor on your record, but it may depend on the specific circumstances of the offense and the policies of the law enforcement agency.
In most states that I know of, one cannot hold a nurses license after having been CONVICTED of a felony.
Can convicted felony be on DC council
Many states of Germany hace changed their apployment policy. A few years ago you had to be a German citizen to become a police officer. Now it is possible to become a police officer without being a German citizen in some States (like Hamburg).