Stalking is generally a course conduct directed toward a specific person (or the person’s family, friends, or work associates) that would cause a reasonable person to be in fear of their safety, health, or well-being. Stalking includes (1) spying on a person; (2) waiting at a location to make unwanted contact with the victim, or to monitor the victim; (3) leaving unwanted items and gifts for the victim; and (4) posting or disseminating information or rumors about the victim on the internet, in a public place, or by word of mouth.

Stalkers may also use technology to harass their victim. Common forms of cyberstalking include:

• e-mail spoofing—sending e-mails pretending to be the victim

• text messaging and sexting (sending sexually explicit text messages or photos)

• social media (Facebook, Twitter, Instagram, etc.)—creating social media accounts and posting statements to harass, threaten, or denigrate the victim, or to impersonate the victim on social media

• online impersonation of the victim through a false identity or account to place online sex ads or solicit sex

• use of GPS to track the victim, including placing a GPS device on the victim’s car.

Stalking is a crime under federal law (18 U.S.C. §2261A) and in each of the 50 states, the District of Columbia, the U.S. Territories, and many Indian Tribes. In addition to stalking laws, every state has laws addressing electronic harassment, and federal law also criminalizes the use of technology to stalk (18 U.S.C. §2261A(2)). Legal definitions for stalking and harassment vary from state to state and in the federal system—especially regarding the stalker’s intent and the nature of the victim’s fear or emotional distress caused by the stalking.

In Colorado, stalking is considered a serious crime and is addressed under Colorado Revised Statutes Section 18-3-602, also known as the 'Vonnie's Law.' Stalking involves a pattern of behavior that includes repeatedly following, approaching, contacting, or surveilling a person, their family, or someone with whom they have a relationship. The behavior must be such that it would cause a reasonable person to suffer serious emotional distress or to fear for their safety or the safety of others. This includes actions such as spying, waiting at locations to make unwanted contact, leaving unwanted items, and posting information about the victim online. Cyberstalking is also covered under this statute and can include email spoofing, sexting, social media harassment, online impersonation, and the use of GPS tracking devices. Stalking is a crime that can be charged as a felony in Colorado, and it is also a federal offense under 18 U.S.C. §2261A. The state of Colorado also has laws against electronic harassment, which complement the federal law criminalizing the use of technology to stalk.