The safety briefing :

FAA REGULATIONS REQUIRE THAT >carrier personnel provide a safety briefing to all passengers before takeoff. This briefing is for the passengers’ own safety and is intended for that purpose only.

Carrier personnel may offer an individual briefing to a person whose disability precludes him or her from receiving the information presented in the general briefing. The individual briefing must be provided as inconspicuously and discretely as possible. Most carriers choose to offer this briefing before other passengers board the flight if the passenger with a disability chooses to pre-board the flight. A carrier can present the special briefing at any time before takeoff that does not interfere with other safety duties.

Carriers may not ‘quiz’ the individual about the material presented in the briefing, except to the same degree they quiz all passengers about the general briefing. A carrier cannot take any adverse action against the passenger on the basis that, in the carrier’s opinion, the passenger did not understand the safety briefing.

Safety briefings presented to passengers on video screens must have an open caption or an insert for a sign language interpreter, unless this would interfere with the video or would not be large enough to be seen. This requirement takes effect as old videos are replaced in the normal course of business.