My company is in the construction industry. We are often asked to sign unconditional waivers saying we received a check, when we actually do not have it in our possession, for them to release the check. We offer to sign a conditional waiver to allow them to release the check and will be happy to sign the unconditional waiver once payment has been received. Is a scanned copy of the unconditional waiver enforceable or are we protected until they have the original? I don't see how they can force us to sign a document saying we have payments we don't have. And does this vary by state? We do business all over the US.