The Short Version
Bihar does operate an inter-caste marriage incentive scheme providing ₹1 lakh, confirmed by the official Government of India myScheme portal and multiple credible news sources. However, the scheme originated in 1979 and was revised to ₹1 lakh in 2015, so describing it as newly "introduced" is imprecise. Additionally, separate programs or proposals involving ₹2.5 lakh exist under different departments, meaning the incentive landscape is more complex than the claim suggests.