From the State of California website: Whatisthecorrectpriceofaniteminastore? California’s Business and Professions Code 12024.2 states that the...

You should not be financially responsible for the fraudulent transactions. You would therefore have no damages to support a claim against Walmart.

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It is unclear from your post the basis of any claims against your sister in law. You may wish to repost with some additional details and context.

These are questions he should be asking his criminal defense attorney. You should not be posting details on a public website.

That is a question you should be asking of your criminal defense attorney. Post nothing further on public websites.

Yes. You should absolutely have a conversation with a local personal injury lawyer.

Since you allege an injury in the course of your employment, you should have a conversation with a local workers compensation attorney.

It is a breach of contract not a code violation.

Check your written contract with Amerigas regarding the terms of when and how you may cancel the contract. My contract with that company required...

Yours is a math question rather than a legal question.