Testing Locations » Rhode Island » Warwick RI » Quest Diagnostics – 215 Tollgate – Employer Drug Testing Not Offered Quest Diagnostics – 215 Tollgate – Employer Drug Testing Not Offered Quest Diagnostics – 215 Tollgate – Employer Drug Testing Not Offered215 Toll Gate Rd Ste 102BasementWarwick, RI 02886-4460 United States Down the street from Kent Hospital. SATURDAY-Walk in onlyrn