Do you know what the time frame is on a valid prescription? Say I have a Rx for cough syrup from 11/11/17 – do I still have a valid prescription?

MRO’s use their discretion on this.  Company policy might apply.  Our team at National Drug Screening, says 

Unless an employer chooses not to accept Rx’s past a certain time, for example 1 year, we will accept old Rxs as long as we can validate them.  So we would accept the Rx from 11/11/17.