If you use a Debit Card you should read this!  The following is taken from an article in Reader's Digest.  Kauai Frame does not "block" or "place holds" on debit cards, just found this article interesting and informative.

Avoid These Debit Card Traps

New scams, fees, and traps to avoid.

When Ann Agent of Portland, Oregon, was planning to attend a children's book publishing conference in Tulsa, Oklahoma, she booked her hotel room over the phone by debit card. She and three colleagues intended to split the bill and each pay the hotel directly at checkout time.

Two days into the conference, Agent's husband called from home to read her a letter from her bank: Her checking account was overdrawn, and she was being charged $35 a day in overdraft fees. "I thought there had to be a mistake," Agent, 45, says. "I keep close track of my account balance."

Turns out when Agent reserved the room, the hotel "blocked," or held, enough money in Agent's account to cover the entire four nights' stay, plus miscellaneous charges, amounting to $580. This blocked every available penny she had and caused her to overdraw. The charges weren't reversed until Agent returned home the following Monday.

Holds are common practice in the travel and hospitality industry. They're the merchant's way of ensuring you'll pay your bill. If you rent a car, the agency could block several thousand dollars to make sure you return the vehicle. Some restaurants will place debit card holds for large parties, and a friendly bartender can put a hold on your card if you start a tab. The hold is usually removed within five business days, sometimes much sooner.

Gas stations are notorious for holds. On a Friday morning in January 2005, Jessica Hathaway of Allentown, Pennsylvania, bought $22.29 of gas by debit. On Saturday, the 34-year-old single mother of three checked her bank balance and learned she was almost broke. Right before the gas station debited Hathaway's account for the gas, it imposed a $75 block.

"I was living paycheck to paycheck. I didn't have much extra in my account, and this $75 charge worried me all weekend," she says. Hathaway was out of luck—and cash—until the following Tuesday, when her bank released the hold.

The kind of hold Hathaway described is a standard preauthorization for signature (non-PIN) transactions. Stations vary widely in their hold amounts. Because Hathaway bought gas before the weekend, her hold may have taken longer than usual to clear.

Avoid the Trap

Leave your debit card at home when traveling. "People should use a credit card, even if they don't any other time," advises Clark Howard, consumer advocate and radio host of The Clark Howard Show. Never use a debit card any place your card is taken out of sight, like a restaurant. Book dinner reservations on a credit card. If you must use debit at a gas station—a hot spot for skimming—use your PIN inside or at the pump. Your card is safest if it stays in your hand, and typing in a PIN eliminates the hold.