Who can arrest me?
All law enforcement officers (such as police officers, county deputy sheriff, investigators in a district attorney's office or an attorney general's office, and highway patrol officers) can arrest you whether they are on or off duty, in most cases. A probation or parole officer also can arrest you. They can arrest you even if they do not have an arrest warrant - if they have probable cause or good reason to believe you committed a felony. A felony is a crime of a more serious nature than a misdemeanor, usually punishable by imprisonment for more than a year. A misdemeanor is usually punishable with a fine or a jail term less than one year.) They do not have to see you commit a felony in order to arrest you. They do, however, have to see you commit a misdemeanor in order to arrest you, in most instances.
If you commit an infraction, they may ask you to sign a citation or notice instead of taking you into custody. This is a minor offense, such as a moving violation, where the punishment usually is a fine. If you sign the citation, you are not admitting guilt; you are only promising to appear in court. If you have no identification or refuse to sign, however, an officer may take you into custody.