Since 2009, at least 45 people have been killed in Craigslist-related crimes.

Some police departments across the country are attempting to curb this disturbing trend by launching Craigslist transaction "safe zones."

Kurt "The Cyber Guy" Knutsson appeared on "Fox and Friends" today to explain these safe zones and how you can use Craigslist without putting yourself in danger.

Knutsson revealed that the safe zones are located at police stations or sheriff's stations in the parking lot or lobby. Crooks are much less likely to commit a crime if there are authorities nearby.

If you're unable to complete the transaction at a safe zone, Knutsson recommended that you meet during the day in a safe, public area. He added that you should not go alone and be sure to let people know about the meet-up. It's also a good idea to leave the stranger's contact information with someone who you trust.

Knutsson also shared some red flags to look out for on Craigslist or any online ad: a vague initial inquiry, poor grammar or spelling, the word "guarantee," a mention of shipping for a local transaction and payment through Western Union, MoneyGram or PayPal, as opposed to cash or a cashier's check.

Watch the "Fox and Friends" clip above to get more tips on how to stay safe on Craigslist.