Nope, no drug usage last night. (DVD to LE for 17+ hours, while his daughter was missing). I would call that a DELIBERATE LIE. One which may have cost his daughter her life.
Nope, no one else accessed upstairs (same as above).
Nope, no unusual sexual behavior with others IN OUR HOME in the past (same as above).
These are examples of DELIBERATE DECEIT, as opposed to forgetting to mention stopping at the cleaners.
Yes, the conversation took place later in the day and wasn't volunteered immediately. But it is not as you portray that he lied continuously for 17 straight hours about that.