Of course! The may be off duty but they can still arrest you.
Yes, as long as they carry their warrant card. A citizen can arrest you if they witness you commit a crime. Police can do it if they suspect you have or are about to, whether they are on duty or not.
If you are a police officer you would not need to ask. A police officer doing his duty will treat another police officer as any member of the public (if they are out of uniform and off duty).
Yes, an off-duty officer can arrest a DUI offender or any offender for that matter
A police officer is a police officer 24/7/365, whether they on or off duty, or whether they're on vacation or not. every police officer has an on duty and off duty gun, they can only carry their off duty guns, and can only use it if he/she or someone else is in danger.
No, an off duty officer can not issue a ticket in the state of Alabama. An officer must be on duty before they arrest someone or issue a ticket.
Generally speaking, yes.
If they are retired no. But , if they are not retired then they can if they wanted.
No he doesn't have to tell you. However, if the off-duty officer is interacting with you in his official capacity, he must identify himself at that point
Yes, an off duty police officer can write a ticket on or off duty. The ticket can be mailed to you, or you can be served with a subpoena to appear in court to answer to the charge on the ticket.
Is it legal? If the off duty police officer has commited some sort of ticketable offense, yes.
Yes. In most cases an off-duty officer can also issue a ticket either at that time or at a later time.