Tub piping @ slab foundation

The tub appeared to have no trap or visible vent. Being this is a slab foundation how would they attach the trap. It is required on a slab home or am I to be corrected.

Besides the stand pipe for the washing machine being improprly installed & the cold water not operating my concern was the trap & vent. The tub did drain properly.



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David, the trap is typically below the slab.