What can one really say about a drug screening facility? Lab Corp. is clean, quick(I was the only person there at 2 in the afternoon) and they provide water for those not quite ready. Things to know: make triple sure you have the right documents and be aware of their hours! I didn’t have the right pre-employment screening form and had to come back the next day. Hours are strictly 8am-12pm and 1pm-4pm.