Burn Notice Season 4 Episode 1 (Burn Notice s04e01) with title “Friends and Enemies” airs on Thursday, June 3rd 2010 at 09:00 pm via USA.
Here is summary for Burn Notice Season 4 Episode 1 :

In Season 4 premiere, A lawyer needs protection from a ruthless biker gang. Elsewhere, Michael tries to thwart a terrorist threat and must join forces with an unexpected partner

Few hours after original series aired on TV, online streaming video for Burn Notice Season 4 Episode 1 usually available on Net and of course, if video available, as soon as possible will show you where you can watch this episode for free.