Based on the relevant Iowa Code section, there would seem to be more required than simply to sit in a parking lot one time:
2. A person commits stalking when all of the following occur:
a. The person purposefully engages in a course of conduct
directed at a specific person that would cause a reasonable person to
fear bodily injury to, or the death of, that specific person or a
member of the specific person's immediate family.
b. The person has knowledge or should have knowledge that the
specific person will be placed in reasonable fear of bodily injury
to, or the death of, that specific person or a member of the specific
person's immediate family by the course of conduct.
c. The person's course of conduct induces fear in the
specific person of bodily injury to, or the death of, the specific
person or a member of the specific person's immediate family.
And some definitions of terms used:
b. "Course of conduct" means repeatedly maintaining a visual
or physical proximity to a person without legitimate purpose or
repeatedly conveying oral or written threats, threats implied by
conduct, or a combination thereof, directed at or toward a person.
c. "Immediate family member" means a spouse, parent, child,
sibling, or any other person who regularly resides in the household
of a specific person, or who within the prior six months regularly
resided in the household of a specific person.
d. "Repeatedly" means on two or more occasions.
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