I think "probable cause" is the legal term.
Probable cause
Nope. The Police and Prosecuting Attorney are not required to act on any accusation other than that contained in an arrest warrant.
A humble arrest is when the person wanted for a crime turns themselves in. This is the most desirable position for the accused to be in.
A person is "under arrest" when a police officer charges them with a crime and chooses to take them to the police station to be processed for it. For example, if someone commits a crime, they are technically under arrest when a police officer witnesses the crime or has a warrant for the arrest and tells the criminal "You are under arrest." Typical procedure after this is to put handcuffs on the criminal and read them their Miranda rights (you have the right to remain silent etc). Handcuffs alone do not mean arrest, but i'm pretty sure its illegal for a police officer to handcuff someone without grounds to arrest them. As a side note, the person doing the arrest does not have to be a sworn in police officer. In Citizen's arrest cases, anyone with arresting powers like a bounty hunter can also place someone under arrest.
A police officer must have probable cause in order to arrest someone. They can arrest a person if they see a crime taking place or if an arrest warrant has been issued.
in a crime
An arrest refers to the lawful deprivation of the freedom of an individual by a peace officer. A police officer may arrest a person if he reasonably believes a crime has been committed without a warrant.
The police accused me of crime but I had a perfect alibi,I was at the police station when the crime occurred.
A person can be apprehended (usually by the police) if he suspect of being guilty of an arrestable offence. The way to apprehend a person is to arrest him. Arrest can also be ordered by the court though warrants. We can use "arrest" in any case since "apprehend" is too formal.
No. If the officer doesn't believe a crime has been committed and there is some evidence the accused is responsible, taking the accused into custody would only aggravate an unlawful situation. An alternative to taking a person into custody on a citizen's arrest is to issue a citation or summons to appear in court, with the citizen making the arrest signing the citation as the complainant. Whether this option is available depends on the local laws and legal customs.
It depends on what crime you have been accused of. And yes, if someone files a report on you they can arrest you with evidence for a minimum of 48hours even if the report turns out wrong.
According to the Fifth Amendment, a person accused of a crime is entitled to due process of law.
It can depend on what the juvenile arrest was for. For a felony crime? Probably not.