Sorry, should have specified that it's for California (both cops and guards). And it might be a highball figure (I didn't search too much).
From your article:
> There's also a lot of range between salaries in different parts of the country. In San Francisco, one of the least affordable cities in the country, cops get paid the most to reflect the cost of living, with an annual mean wage of $99,000. Meanwhile, cops in rural Mississippi earn the least: $29,870.
Similarly, prison guards also get paid more in California.
Whatever the case, I think cops do get paid a bit more, but I think it's much harder to get the job. Police might be penalised a bit for being in a glamour profession though (there's more people who want to be cops than prison guards - not many movies have a prison guard as the hero).