What are the dangers in mulch that landscapers use?

I heard that sometimes old wood from pressure treated wood will wind up
in the mulch. Pressure treated wood contains copper arsenic that can
leach into the soil or perhaps under foot and introduced into the house
where your baby is crawling.

I was told that wood mulch also attracts termites to your house and
should kept at least 6" from your house.?

Thanks.