when did LCN discontinue lead lining

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The determination was made that Lead Lined covers are no longer needed for the LCN product line, see below Marketing/EHS document. Lead Lined cover discontinuation letter
Not specifically for lead lined doors.  But the standard hinges should work and not hit the lead lining in the door.  Since standard lead layers vary, check with door manufacturer an...
XL11-515 is an option for lead lining on the L9000 series mortise locks. XL12-216 is an option for lead lining on the L400 mortise locks.
Lead lining is not needed, since the channel or through bolt is solid and the x-rays will not penetrate the solid metal.
The door template L1 states: "Lead Lining: When L9000-Series or L400-Series locks are ordered with lead lining, add 1/8" to the width of the mortise cut-out on the lock case cover side of installa...