The technology is apparently so high-tech that Amazon employees tried wearing Pikachu costumes to fool the system and failed. The only Achilles heel not yet fixed is the tech's inability to charge large groups of shoppers such as families.

Bloomberg reports that "engineers have been studying families shopping together and are tweaking their sensors to recognize when a child eats an item while wandering around the store. Engineers are also figuring out which person to charge when a couple goes shopping together. Amazon has encouraged employees to enter the store in pairs and buy lunch."

Though Amazon Go stores were supposed to go nation-wide this year, technical difficultieskept that from happening. Amazon has now hired construction managers with the expressed intention of building the first stores.

"Analysts expect a version of Amazon Go technology to be rolled out eventually at Whole Foods," reports Bloomberg. "That’s a far more challenging prospect because Whole Foods locations are much larger than the 1,800-square-foot convenience store and carry thousands more products. Amazon, which says it currently has no such plans, would need a lot more testers wearing Pikachu costumes to pull that off."