If you're going to post a sign that cites to the CFR, maybe you should consider reading the CFR itself. In this case, the only screening authorized is
Security measures for access control.
Security measures for access control.
In general, though, here's something to keep in mind: posting a sign that says "By doing X, you consent to Y" doesn't do jack squat in terms of giving you authority to do Y just because someone did X. Either there's law giving you that authority under those circumstances or there isn't. Notice (i.e., a sign) may be relevant to the analysis, but posting a sign isn't necessarily like putting a contract out there for people to sign.
As I don't work on a dive boat or have numbers to a secret wreck I don't have a dog in this fight. I was posting the signs as an example of something that the captain could use as an excuse to search a bag.
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