I visit Craigslist daily.

I have had cause to do business on craigslist. Not the personals type.

On Craigslist, like other online business transaction sites, you worry about fraud. You want to pick up purchases in a public place. You want to pay with cash and only when you have the product on hand.

Now you have to worry about being murdered. Thanks to Philip Markoff, the 22-year-old Boston University medical student who murdered Julissa Brisman, in a luxury Boston hotel. It was part of a crime wave that targeted vulnerable women.

He was a clean-cut student who had everything going for him. He had no criminal record. He came from a good family. He had a fiancée he was getting ready to marry. But he also had a dark side he did not show anyone.

This most unlikely suspect adds to the long list of most unlikely suspects who have been caught in horrendous crimes. The same goes for Melissa Huckaby, the California woman who teaches Sunday school and is now accused of killing her daughter’s playmate.

Now we all are suspects until proven otherwise. Not your look, your status, your smile, your demeanor will exempt you if you are remotely connected to a scene of a crime.

Not long ago, it used to be that when you call the police and report a crime, the police begin to look outside for possibly suspects. Now, they begin from you as the suspect.

One of Philip Markoff’s undoing was his use of email to communicate with the women victims. His emails tied him to the crimes.

The new fingerprint is your IP address. While seasoned criminals wear gloves to avoid leaving fingerprints, the internet criminals haven’t yet figured out what glove to wear to cover their IP address.

It is a sad day for we all are now seen as criminals until proven innocent.