[Lent]

“In this case and investigation, Lewandowski wasn’t arrested either”

Yes he was arrested:

“He was arrested and released with a Notice to Appear,” said Officer Adam Brown, a spokesman for the Jupiter police. “
http://www.theatlantic.com/politics/archive/2016/03/corey-lewandowski-arrested/475827/

[Fantasywriter]

If Lewandowski was arrested, why is there no mug shot?

[Cboldt]

Well, I suppose that depends on what is meant by "arrested."

Lewandowski appeared Tuesday morning at the Jupiter Police Department at the Department's request, police and Trump campaign officials said. Trump's campaign denied that Lewandowski was arrested. "Mr. Lewandowski was issued a Notice to Appear and given a court date. He was not arrested," the campaign said in an unsigned statement.

But a spokesperson for the Jupiter Police Department told TIME that there's no difference. "A notice to appear is an arrest," said Adam Brown, the spokesman. "Mr. Lewandowski was released with a Notice to Appear in court."

Donald Trump Campaign Manager Charged for Grabbing Reporter | Time.com | March 29, 2016

A traffic infraction, ticket, is a summons to court - a notice to appear. Is one arrested when one gets a ticket? You will get arrested (in the common and ordinary use of that word) if you don't sign the ticket!