# File app/models/rescue_session.rb, line 16
  def self.create_for(person)
    # Delete any previous rescue sessions for this person
    if sess = self.find_by_person_id(person.id)
      sess.destroy
    end

    sess = self.new(:person => person, 
                    :link => Digest::MD5.hexdigest(String.random(16)))
    sess.save!
    return sess
  end