You can watch several seasons of Adam-12 (the original, as well as the awful sequels), Dragnet, Emergency, and other wonderful shows from the 60s-70s online for free at Hulu, no membership or sign-in required.

Adam-12 - Full Episodes and Clips streaming online - Hulu

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I've watched them all, and they are great.

I have zero interest in modern TV. I can't even bear to watch the news anymore, all of D.C. being so dreadful, especially that clown in the White House, and all the people who's job it is to stop him, but don't.