WHEN IS THERE A LAWFUL WARRANTLESS ARREST?

1.    When, in his presence, the person to be arrested has committed, is actually committing, or is attempting to commit an offense;

2.    When  an  offense  has  just  been  committed  and  he  has  probable cause  to  believe  based  on  personal  knowledge  of  facts  or circumstances that the person to be arrested has committed it;

3.    When  the  person  to  be  arrested  is  a  prisoner  who  has  escaped from  a  penal  establishment  or  place  where  he  is  serving  final judgment or is temporarily confined while his case is pending, or has  escaped  while  being  transferred  from  one  confinement  to another

4.    Hot pursuit