The Patriots are scheduled to host safeties Patrick Chung (Oregon), William Moore (Missouri) and Louis Delmas (Western Michigan) on pre-draft visits at Gillette Stadium, according to league sources.
NFL teams are allowed up to 30 pre-draft visits with out-of-town prospects at their facility. The purpose of the visits can vary -- from genuine interest, to a smokescreen, to a final medical check. Sometimes, the coaches might want to put the players up on the board or watch game film, asking them to dissect Xs and Os.
It's quite possible that a visit ends up ruling a player out of a team's plans (e.g. the player doesn't show the football acumen needed for a specific scheme).
From this view, the visits are helpful to chart, but also important to keep in perspective.
The Patriots, for example, did not host Logan Mankins on a pre-draft visit prior to drafting him in the first round in 2005. On the flip side, the team did host linebacker Jerod Mayo last year.