The ADA expressly provides that a public accommodation may exclude an individual, if that individual poses a direct threat to the health or safety of others that cannot be mitigated by appropriate modifications in the public accommodation's policies or procedures, or by the provision of auxiliary aids. A public accommodation will be permitted to establish objective safety criteria for the operation of its business; however, any safety standard must be based on objective requirements rather than stereotypes or generalizations about the ability of persons with disabilities to participate in an activity.