For a peer reviewer of a proposal to send it to anyone else is both unethical and against the basic black-letter rules. Anyone doing peer reviews of proposals

For a peer reviewer of a proposal to send it to anyone else is both unethical and against the basic black-letter rules. Anyone doing peer reviews of proposals will be asked to ensure confidentiality of proposals under review. (https://grants.nih.gov/policy/research_integrity/confidentiality_peer_review.htm https://grants.nih.gov/policy/research_integrity/confidentia...) The level of paranoia around proposals is much higher than, say, peer reviews for conferences or journal papers, where sometimes a paper might be given to a grad student to take a look at.