My approach to contractors has always been, treat their employees like
your own employees. You establish clear, attainable expectations
(often rules), and there are consequences for not meeting those
expectations. For employees, there is a progresive discipline system
that allows you establish behavior trends and eliminate unexceptable
behavior (below expectations). For contractors, I have always used the
first time shame on me, second time shame on you approach. The first
time I observe behavior obviously below expectations (violation of
policy), I treat it as, "I must not have communicated this properly"
and we have a discussion to clearly re-establish my expectations.
Second time, I have you leave the job site, return the next day where
we sit down (the contact employee, supervisor and me) and you convice
me that safety is important to you and you should be allowed to
return. Third time, not allowed back. Non-contract employees usually
get a fourth chance before termination and often get an un-documented
verbal warning before one is commited to paper, but the concept is the
same and the "increased" contractor accountability is based on
fatality risk (as in your example, a contractor not being tied off is
a much greater risk then an employee without earplugs or gloves).
This approach does take some time (your time) to establish as you have
to leave your mornings open, but once your contractors understand your
expectations and know you will take action, they will make sure their
employees follow expectations.
Posted by Russ Kapperman