After hours emergencies happen. TSS, inc. crews are on call 24/7. Our after-hours information can be obtained for each office via the location voice-mail. It is the policy of this company to respond as quickly as possible to your call. TSS, Inc. staff will arrange with the caller how to best accomplish the drug screen in a timely manner. Prompt testing is necessary to get the appropriate findings. Medical needs come first. This is one time TSS will be second.