It also recommended that, beginning this July, the banks voluntarily test all transfusion recipients since 1977 for possible exposure to the AIDS virus.

It's like voluntarily testing a track athlete and saying: 'If you'd like to, give us a urine sample.

But few of these patients have their driving skills tested voluntarily during this time because of the tests' limited availability and cost, and the emotionally wrenching nature of the driving issue, Dr. McConnell said.

At the academy's annual meeting last March, 3,500 members agreed to have themselves voluntarily tested for the AIDS virus, Dr. Sarmiento said.

Voluntarily testing beyond the C.I.P. maximum pressure limit is also possible for consumers who intend to use their firearms under extreme conditions (hot climates, long strings of shots, etc.).

If a vehicle owner chooses not to test voluntarily or is no longer eligible for a 0 or 00 sticker, they are subject to a set of rules separate from locally plated vehicles.

Voluntarily testing beyond the current legally required standard test benchmark is often also possible for consumers who intend the use their firearms under extreme conditions (hot climates, long strings of shots, etc.).

Private wells serving residences and schools are not presently regulated, but Newtown school officials voluntarily tested the wells of the town's six public schools after hearing about the situation with the Marks family.

In crowdsource testing, people voluntarily test a software with the possibility of not being paid (if no bugs are discovered).

While General Cinema is voluntarily testing the systems, some people with disabilities are bringing pressure on the movie theater industry to move faster.