Thanks to all who replied. I'd like to share the information about online application signatures I received from BLR.
With an online application, there are a few options for employers to obtain applicants’ signatures for these certifications. First, the employer can obtain the applicant’s signature at the time of the interview or when a conditional offer of employment has been made. Second, the employer can require applicants to mail in the portion of the applicant requiring their signatures. Finally, employers may obtain applicants’ signatures electronically. The Electronic Signatures in Global and National Commerce Act generally makes electronic signatures and electronic contracts just as legal and enforceable as paper contracts signed in ink for almost all transactions. The law does not specify a particular technology that must be used. States are required to enact laws that set out requirements for electronic signatures. Under this law, almost all private transactions, such as employment applications, may be accomplished electronically.