Service animals – For evidence that an animal is a service animal, air carriers may ask to see identification cards, written documentation, presence of harnesses or tags, or ask for verbal assurances from the individual with a disability using the animal. If airline personnel are uncertain that an animal is a service animal, they may ask one of the following:


Level AA is a little more significant, and makes sites accessible to people with a wider range of disabilities, including the most common barriers to use. It won't impact the look and feel of the site as much as Level AAA compliance, though it does include guidance on color contrast and error identification. Most businesses should be aiming for Level AA conformity, and it appears to reflect the level of accessibility the DOJ expects. 
Individuals with disabilities may use service animals and emotional support animals for a variety of reasons. This guide provides an overview of how major Federal civil rights laws govern the rights of a person requiring a service animal. These laws, as well as instructions on how to file a complaint, are listed in the last section of this publication. Many states also have laws that provide a different definition of service animal. You should check your state’s law and follow the law that offers the most protection for service animals.  The document discusses service animals in a number of different settings as the rules and allowances related to access with service animals will vary according to the law applied and the setting.
Title III also has applications to existing facilities. One of the definitions of "discrimination" under Title III of the ADA is a "failure to remove" architectural barriers in existing facilities. See 42 U.S.C. § 12182(b)(2)(A)(iv). This means that even facilities that have not been modified or altered in any way after the ADA was passed still have obligations. The standard is whether "removing barriers" (typically defined as bringing a condition into compliance with the ADAAG) is "readily achievable", defined as "...easily accomplished without much difficulty or expense".
However, in states that have enacted laws that allow private individuals to win monetary awards from non-compliant businesses (as of 2008, these include California, Florida, Hawaii, and Illinois), "professional plaintiffs" are typically found. At least one of these plaintiffs in California has been barred by courts from filing lawsuits unless he receives prior court permission.[55] Through the end of fiscal year 1998, 86% of the 106,988 ADA charges filed with and resolved by the Equal Employment Opportunity Commission, were either dropped or investigated and dismissed by EEOC but not without imposing opportunity costs and legal fees on employers.[50]
Colleges and universities may have a policy asking students who use service animals to contact the school’s Disability Services Coordinator to register as a student with a disability. Higher education institutions may not require any documentation about the training or certification of a service animal. They may, however, require proof that a service animal has any vaccinations required by state or local laws that apply to all animals.

Many people with disabilities use assistive technology that enables them to use computers. Some assistive technology involves separate computer programs or devices, such as screen readers, text enlargement software, and computer programs that enable people to control the computer with their voice. Other assistive technology is built into computer operating systems. For example, basic accessibility features in computer operating systems enable some people with low vision to see computer displays by simply adjusting color schemes, contrast settings, and font sizes. Operating systems enable people with limited manual dexterity to move the mouse pointer using key strokes instead of a standard mouse. Many other types of assistive technology are available, and more are still being developed.


Colleges and universities may have a policy asking students who use service animals to contact the school’s Disability Services Coordinator to register as a student with a disability. Higher education institutions may not require any documentation about the training or certification of a service animal. They may, however, require proof that a service animal has any vaccinations required by state or local laws that apply to all animals.
Federal law isn't the only consideration for businesses. Additionally, each state interprets the law differently. Consider the case against Netflix in 2012. Lawsuits were brought in federal court in Massachusetts and California. Netflix was accused of violating the ADA by not offering "closed captioning" options for its Internet streamed movies. Illustrating the complexity of this issue, the courts reached completely opposite decisions. Massachusetts held that Netflix must comply with the ADA, while the California court found that Netflix did not fall under the ADA's definition of "public accommodation."
The ADA requires that title II entities (State and local governments) and title III entities (businesses and nonprofit organizations that serve the public) communicate effectively with people who have communication disabilities. The goal is to ensure that communication with people with these disabilities is equally effective as communication with people without disabilities.
Level AA is a little more significant, and makes sites accessible to people with a wider range of disabilities, including the most common barriers to use. It won't impact the look and feel of the site as much as Level AAA compliance, though it does include guidance on color contrast and error identification. Most businesses should be aiming for Level AA conformity, and it appears to reflect the level of accessibility the DOJ expects. 
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