Must I evict my 19-year-old son from the home at the request of my traveling husband, knowing that he is absent from the home for days without permission?

Do not expel your son from the house unless his staying there causes a great corruption that outweighs the corruption of expelling him. In that case, you must obey your husband, because expelling a child from the house due to engaging in evil deeds and disobedience often leads to great corruption. Therefore, it is advisable to counsel him with wisdom and to agree with your husband on means to reform him, and to consult righteous people specialized in education, while seeking Allah's help and frequently supplicating for his guidance.