To their credit, Dollar responded to my letter in less than a week. To their detriment, it obviously is a form letter. Posted in its entirety:
(only my name changed)

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Dear Mr. Duxfan,

I am responding to your letter to Mr. Jim Senese, Vice President of Quality Assurance, objecting to Dollar's trial practice of requiring the thumbprints of customers as part of the rental process. Dollar has begun this procedure on a trial basis to help reduce the loss of its vehicle inventory due to theft and fraud. Ultimately, Dollar hopes this practice will significantly reduce its costs of doing business and result in lower prices for its customers. Other businesses use the same procedure for similar reasons with documented success.

With regard for any concern for privacy, Dollar shares a thumbprint with law enforcement agencies only in event of a fraudulent rental or theft of a vehicle. After the rental, the thumbprint is stored with other rental information, such as credit card information, for seven years and then destroyed. While stored the information is treated as confidential and is not shared with anyone.

I hope this letter addresses your concerns and you will consider becoming a Dollar customer again in the future.

Sincerely,

Shannon Beasley
Dollar Customer Center, Executive Desk

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I still object to a private company retaining my fingerprint for 7 years! I asked that Dollar delete my FastLane account, but apparently that will remain for 7 years as well.

Sorry Dollar, that dog just won't hunt! I guess instead of Dollar, I'll have to go for "Change"....