In my experience in prosecuting claims against Walmart they generally have video of everything that happens at a store. You should attempt to secure that video. It is best to consult with a lawyer experienced in these types of claims to help you.
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You should contact a personal injury attorney experienced in premises liability claims.
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This is probably considered a healthcare liability claim under Chapter 74 of the Texas Civil Practices and Remedies Code. You should consult a lawyer experienced in this area of the law for advice and additional information.
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