True or False: The Sales and Use Tax Law states all sales are assumed taxable unless documented otherwise.

The statement is true because, under the Sales and Use Tax Law, there is a general presumption that all sales of tangible personal property are taxable unless there is specific documentation to verify an exemption. This means that unless a seller can provide the necessary proof, such as a valid exemption certificate or documentation of a particular circumstance that qualifies for tax-exempt status, the transaction is assumed to be subject to sales tax. This principle helps ensure compliance with tax regulations and encourages proper record-keeping by both buyers and sellers to substantiate any claims for tax exemption.