Salon reports that a Brazilian wandering spider was found in a grocery in Tulsa, Oklahoma. The reporting here is a bit sensationalistic. The wanderer is fairly likely to give a dry bite as a warning before it spends any of its venom on a non-prey animal such as a human.
The wandering spiders are dangerous largely because they shelter in shoes and other niches where people are likely to put their fingers or toes. They're aggressive, too, or at least eager to defend themselves when they suspect you might attack.