Watching tv again

[RocketFoot]

Yeah, I know, it's Hollywood.
In this case, blue bloods and I'm struck by the wearing of neck ties. Not clip on ties, but actual tie a Windsor knot ties.  When I was on the job, clipons were the thing. I suppose it's only tv, but are real ties actually worn on the job?

I would think clip on's would be safer...real ties might be a strangulation danger in the event of a tussle with a perp.