<Page>
EX-99.CERT
CERTIFICATIONS
Pursuant to Section 302 of the
Sarbanes-Oxley Act of 2002
I, Robert S. Dow, certify that:
1. I have reviewed this report on Form N-CSR of Lord Abbett U.S.
Government Securities Money Market Fund, Inc.;
2. Based on my knowledge, this report does not contain any untrue
statements of material fact or omit to state a material fact necessary
to make the statements made, in light of the circumstances under which
such statements were made, not misleading with respect to the period
covered by this report;
3. Based on my knowledge, the financial statements, and other financial
information included in this report, fairly present in all material
respects the financial condition, results of operations, changes in
net assets, and cash flows (if the financial statements are required
to include a statement of cash flows) of the registrant as of, and
for, the periods presented in this report;
4. The registrant's other certifying officers and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Rule 30a-2(c) under the Investment Company Act of 1940) for
the registrant and have:
a) designated such disclosure controls and procedures to ensure
that material information relating to the registrant,
including its consolidated subsidiaries, is made known to us
by others within those entities, particularly during the
period in which this report is being prepared;
b) evaluated the effectiveness of the registrant's disclosure
controls and procedures as of a date within 90 days prior to
the filing date of this report (the "Evaluation Date"); and
c) presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures
based on our evaluation as of the Evaluation Date;
5. The registrant's other certifying officers and I have disclosed, based
on our most recent evaluation, to the registrant's auditors and the
audit committee or the registrant's board of directors (or persons
performing the equivalent functions):
<Page>
a) all significant deficiencies in the design or operation of
internal controls which could adversely affect the
registrant's ability to record, process, summarize, and
report financial data and have identified for the
registrant's auditors any material weaknesses in internal
controls; and
b) any fraud, whether or not material, that involves management
or other employees who have a significant role in the
registrant's internal controls; and
6. The registrant's other certifying officers and I have indicated in
this report whether or not there were significant changes in internal
controls or in other factors that could significantly affect internal
controls subsequent to the date of our most recent evaluation,
including any corrective actions with regard to significant
deficiencies and material weaknesses.
Date: August 21, 2003
/s/ Robert S. Dow
Robert S. Dow
Chief Executive Officer,
Chairman and President
<Page>
CERTIFICATIONS
Pursuant to Section 302 of the
Sarbanes-Oxley Act of 2002
I, Joan A. Binstock, certify that:
1. I have reviewed this report on Form N-CSR of Lord Abbett U.S.
Government Securities Money Market Fund, Inc.;
2. Based on my knowledge, this report does not contain any untrue
statements of material fact or omit to state a material fact necessary
to make the statements made, in light of the circumstances under which
such statements were made, not misleading with respect to the period
covered by this report;
3. Based on my knowledge, the financial statements, and other financial
information included in this report, fairly present in all material
respects the financial condition, results of operations, changes in
net assets, and cash flows (if the financial statements are required
to include a statement of cash flows) of the registrant as of, and
for, the periods presented in this report;
4. The registrant's other certifying officers and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Rule 30a-2(c) under the Investment Company Act of 1940) for
the registrant and have:
a) designated such disclosure controls and procedures to ensure
that material information relating to the registrant,
including its consolidated subsidiaries, is made known to us
by others within those entities, particularly during the
period in which this report is being prepared;
b) evaluated the effectiveness of the registrant's disclosure
controls and procedures as of a date within 90 days prior to
the filing date of this report (the "Evaluation Date"); and
c) presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures
based on our evaluation as of the Evaluation Date;
5. The registrant's other certifying officers and I have disclosed, based
on our most recent evaluation, to the registrant's auditors and the
audit committee or the registrant's board of directors (or persons
performing the equivalent functions):
<Page>
a) all significant deficiencies in the design or operation of
internal controls which could adversely affect the
registrant's ability to record, process, summarize, and
report financial data and have identified for the
registrant's auditors any material weaknesses in internal
controls; and
b) any fraud, whether or not material, that involves management
or other employees who have a significant role in the
registrant's internal controls; and
6. The registrant's other certifying officers and I have indicated in
this report whether or not there were significant changes in internal
controls or in other factors that could significantly affect internal
controls subsequent to the date of our most recent evaluation,
including any corrective actions with regard to significant
deficiencies and material weaknesses.
Date: August 21, 2003
/s/ Joan A. Binstock
Joan A. Binstock
Chief Financial Officer and Vice President