Walmart is not a government entity so no 4th Amendment. There is the issue of false imprisonment but there is a shop keepers privilege.
The "shopkeeper's privilege" expressly grants an employee the authority of law to detain a customer to investigate the ownership of property in a reasonable manner and for a reasonable period of time if the employee has a reasonable belief that the customer has stolen or is attempting to steal store merchandise. Tex. Civ. Prac. & Rem. Code Ann. § 124.001 (West 2005).
I offer free consultations and am quite familiar with family judges in Harris County and nearby counties.
Mr. Dick is licensed to practice law in Texas and office located in Harris County. His phone number is 832-207-2007 or 713-510-4500 or his email address is listed below.
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Yes it is legal. In fact, if you do not show a receipt, the greeter has no way of knowing that you were not stealing the sodas. Place yourself in the greeter's shoes, and you can see that the greeter was just trying to do his or her job.
The last thing that you want to do is call the police on yourself on a point of principle. Life is too short to waste time like that. But, you do not want to sign an agreement or citation to ban yourself from Walmart unless you were actually stealing the sodas. You should have simply shown the receipt for the soda purchase, and ended the matter. Chalk it all up to a lesson learned.