Forms - Forged Signatures

I am fairly new to Acrobat Pro, but not to IT - been doing system administration for 10 years now.
We had a user create a form that is used for the hiring process that requires several signatures from different people. Recently, we've had issues come up where users are forging signatures for other users.
Note: There was no design or implementation of this sort of thing planned out. All that has been done quite literally is that a single user created a form for hiring that requires digital signatures from multiple users. We have setup no infrastructure for this purpose at all.
After reading through Adobe documentation, I'm more confused about it than when I started. It sounds like it shouldn't be possible for a single user on a single computer to have multiple different signatures, but it is, and I'm not sure how to tackle the problem.
Has anyone come across this type of issue in their workplaces, and if so, how did you handle the problem? How can we make it so that a form holds each user accountable for their signature? Can we track where each signature comes from to narrow down the culprit? How can we prevent further forgeries in the future?

With self-signed certificates, the kind that you can create with Acrobat/Reader, each user decides for themselves whether they can be trusted. If they choose to, the certificate can be added to their list of trusted certificates. A user should choose to trust a particular certificate only if they can confirm the source, such as when someone hands them a flash drive that contains a signed document or receives an email from another person via email just after talking with them on the phone about it, etc. When a certificate has been added to a user's list of trusted certificates, a signature on a document can be fully verified. If someone were to receive a document with a signature that appears to be from someone, it will not be fully validated unless the corresponding certificate has been trusted.
If each user were to use trusted third party certificates (e.g., from Verisign), you would not have to establish this type of direct trust relationship with each user's certificate since that is handled for you by Acrobat/Reader. There is essentially a built-in list of trusted certificate providers and an automatic means to verify such signatures. Unlike the self-signed certificates that anyone can create with Acrobat/Reader, they are not free and involve some sort of verification process so the provider knows you are who you say you are. So such a system relies on the certificate provider getting this part right and not issuing certificates to imposters.
So to summarize, in the case of self-signed certificates, you decide which ones to trust, and in the case of third-party issuers, Acrobat/Reader maintains a separate list. It is each users job to review each signature after verifying each in Acrobat/Reader to see if they're fully validated, and if not, realize that something is wrong (and fire the knuckleheads who are being underhanded).

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